Is this Aires da Serra Hotel pet-friendly for guests?

Yes, pets are allowed at this property. Check the guest reviews to learn what guests had to share.

What time is check-in & check-out at Aires da Serra Hotel?

Check-in time for Aires da Serra Hotel starts counting from 3:00 PM and check-out is until 12:00 PM. However, early check-in or late check-out can sometimes be negotiated between the guest and the owner or the manager of this property.

Does the Aires da Serra Hotel have a swimming pool?

Yes, this Aires da Serra Hotel has a swimming pool. Check the Facility Overview section for details about the pool and other available facilities.

How much does it cost per night to stay in Aires da Serra Hotel?

Best-rates for the Aires da Serra Hotel starts from $112 per night with includes Ocean View, Wellness Facilities, View, Oceanfront, Guest Services, Pet Friendly, Designated Smoking Area, Balcony/Terrace, Accessibility, EV Charge Station, Sports/Activities, Toiletries, Air Conditioner, Wheelchair Accessible, Internet, TV, Business Services, Child Friendly, Pool, Spa, Kitchen, Restaurant, Entertainment, Breakfast, Laundry, Transportation/Shuttle, Security/Safety, Hot Tub, Parking, Fireplace/Heating with all other facilities. matches every traveler with their perfect accommodation, whether you are traveling with a group, friends, family, or pets.

Is Aires da Serra Hotel a family-friendly place to stay?

Based on the information we have received from the owner or our partner, this is considered to be a family-friendly property. Families have rated this hotel 4 stars or guests have recommended them suitable for families. As reported by the owner or manager, the hotel has specified that children are welcome. Please see details about suitability for your family or inquire with the property to learn more.

Is the Aires da Serra Hotel wheelchair accessible or offer services for disabled guests?

Based on the information received from our partner, the Aires da Serra Hotel is wheelchair accessible. Likewise, there is an elevator specified as being available at the property. Specific accessibility details may be addressed in the property details section of this page.

What is the minimum night stay policy for the Aires da Serra Hotel?

Based on the information reported by the owner or manager, the Aires da Serra Hotel indicates 1 day stay policy at this hotel. Guests are cautioned that the minimum stay policy may differ based on seasonality or availability and may be at the discretion of the owner or manager.

What cancellation policy is in place for Aires da Serra Hotel?

Guests are cautioned that the cancellation policy may differ based on seasonality, availability, or current travel restrictions. Guests should also be aware that this policy may be subject to change and should be confirmed prior to booking. More details may be available on this page in the property description. However, early check-in or late check-out can sometimes be negotiated between the guest and the owner or the manager of this property.

Aires da Serra Hotel | Hotel in Torres Novas

| 8.5 (312 Reviews) | Pet Friendly 15 Bathrooms 46 Guests

Torres Novas Hotel | Aires da Serra Hotel

Hotel in Torres Novas

Featuring free WiFi throughout the property, Aires da Serra Hotel offers accommodations in Torres Novas. The property is inserted within tranquil natural surroundings. Some units have a seating area to relax in after a busy day. Certain units include views of the mountains or pool. Each room is fitted with a private bathroom. For your comfort, you will find free toiletries and a hair dryer. A flat-screen TV is provided. You will find a shared lounge at the property. Free private parking is available on site. The property has stations in which the charging of electric vehicles can be done. Nazaré is 29 mi from Aires da Serra Hotel, while Fátima is 12 mi away.

Aires da Serra Hotel is located in Torres Novas.

This 18 Bedrooms Hotel is suitable for tourists and travelers. It has several amenities that would guarantee your comfort. These amenities include: View, Oceanfront, Guest Services, and several others. This is a 4 star rated property and has over 312 reviews with the average score of 8.5 . Coming to Torres Novas and needing a place to stay? Be it for work or for leisure, consider staying at this Hotel for your next visit, you will surely love it.

You can check the reviews and description of this 18 Bedrooms Hotel if you want to learn more about this place in Torres Novas. These details are authentic, as they are provided by our partner, booking.com.

This Aires da Serra Hotel in Torres Novas is well equipped and has all facilities that have been listed below. Please note that these details were shared to us by booking.com for the listed “Aires da Serra Hotel”. We solely rely on their shared details and are regarded as “accurate”. If you have any concerns about the information or accuracy describing this Hotel, please let us know.

Amenities

Air Conditioner

Parking

Pet Friendly

Pool

Designated Smoking Area

View

Wheelchair Accessible

Ocean View

Balcony/Terrace

Oceanfront

Accessibility

Transportation/Shuttle

Security/Safety

EV Charge Station

Business Services

Sports/Activities

Wellness Facilities

Spa

Fireplace/Heating

Restaurant

Toiletries

Guest Services

Entertainment

Breakfast

Child Friendly

Hot Tub

Internet

Kitchen

Laundry

Facility Overview

Breakfast

Breakfast in the room

Fruit

Kid-friendly buffet

Wine/Champagne

Restaurant

Special diet meals (on request)

Parking

Electric vehicle charging station

Private Parking

Free parking

Accessible parking

Parking

Parking on site

Accessibility

Toilet with grab rails

Bathroom emergency cord

Lowered sink

Raised toilet

Wheelchair accessible

Activities

Foot massage

Spa facilities

Full-body massage

Spa lounge/Relaxation area

Hot tub/Jacuzzi

Back massage

Pool table

Game room

Neck massage

Head massage

Hand massage

Massage

Entertainment

Indoor play area

Board games/Puzzles

General

Facilities for disabled guests

Non-smoking rooms

Air conditioning

Soundproof rooms

Pet friendly

Heating

Family rooms

Designated smoking area

Wifi in all areas

Safe

Guest Services

Shared lounge/TV area

Shuttle service (additional charge)

Baggage storage

Private check-in/out

Room service

Airport shuttle

Ironing service

Laundry

Meeting/Banquet facilities

Daily housekeeping

Shuttle service

Airport shuttle (additional charge)

Invoice provided

Internet

Free Wifi

Wifi

Internet

Outdoors

Terrace

Picnic area

Sun deck

Outdoor pool

Garden

Outdoor furniture

Outdoor pool (seasonal)

Security/Safety

Key card access

Fire extinguishers

Smoke alarms

CCTV in common areas

CCTV outside property

Security alarm

Use of cleaning chemicals that are effective against coronavirus

Linens, towels, and laundry washed in accordance with local authority guidelines

Guest accommodation disinfected between stays

Guests have the option to cancel any cleaning services for their accommodation during their stay

Physical distancing in dining areas

Food can be delivered to guest accommodation

Delivered food covered securely

All plates, cutlery, glasses, and other tableware sanitized

First aid kits available

Face masks for guests available

Shared stationery (e.g. printed menus, magazines, pens, paper) removed

Staff follow all safety protocols as directed by local authorities

Hand sanitizer in guest accommodation and common areas

Contactless check-in/out

Cashless payment available

Physical distancing rules followed

Spa

Beach chairs/Loungers

Infinity pool

Pool with view

Swimming pool

Transportation/Shuttle

Airport drop-off

Airport pickup

Policies

Check-in

The minimum age for check-in is 18

Pet Policy

Pets are allowed upon request and charges may apply.

When traveling with pets, please note that an extra charge of 20€ per pet, per night applies. please note that a maximum of 2 pet(s) is allowed please note that the property can only allow pets with a maximum weight of 20 kilo, please note that pets are only allowed in the following room types: superior double or twin room with terrace, studio with terrace, superior king room with jacuzzi, one-bedroom apartmentplease inform of your expected arrival time in advance. you can use the special requests box when booking, or contact the property directly using the contact details in your confirmation.

License number: 6274

Reviews

Value for money:

8.3

Location:

8.66

Staff:

9.35

Facilities:

8.8

Comfort:

9.06

Cleanliness:

9.19

rickmiraldo

Oct 30, 2025 07:00:00 AM

Review Score: 9

Portugal

Reviewer Type: Family With Children

Travel Purpose: leisure

See All Reviews

Room Arrangement

Room Info	Facilities
Double or Twin Room Room Type: Twin/Double Room Size: 21 m² 1 King bed(s) Bed 2 Twin bed(s) Bed	Food & Drink Tea/Coffee maker, Bottle of water Bathroom Toilet, Toilet paper, Hairdryer, Towels, Shampoo, Free toiletries, Private bathroom, Body soap, Bathtub or shower, Shower General Carbon monoxide detector, Key card access, Key access, Tile/Marble floor, Trash cans, Air conditioning, Soundproof, Safe, Smoke Alarm, Hardwood or parquet floors Media & Technology Radio, Telephone, Flat-screen TV, TV, Cable channels Living Area Desk, Sofa Services Wake-up service Kitchen Electric kettle Bedroom Wardrobe or closet, Childrens' cribs, Linens Accessibility Entire unit located on ground floor Room Amenities Non-feather pillow, Clothes rack, Socket near the bed Pool and Spa Pool towels, Pool with a view, Heated pool Physical distancing Single-room AC for guest accommodation Cleanliness & disinfection Hand sanitizer
Double Room with Mountain View Room Type: Double Room Size: 15 m² 1 Queen bed(s) Bed	Food & Drink Tea/Coffee maker, Bottle of water Bathroom Toilet, Toilet paper, Hairdryer, Towels, Shampoo, Free toiletries, Private bathroom, Body soap, Bathtub or shower, Shower General Carbon monoxide detector, Key card access, Key access, Tile/Marble floor, Trash cans, Air conditioning, Soundproof, Safe, Smoke Alarm, Hardwood or parquet floors Media & Technology Radio, Telephone, Flat-screen TV, TV, Cable channels Living Area Desk, Sofa View Mountain view, View Services Wake-up service Kitchen Electric kettle Bedroom Wardrobe or closet, Childrens' cribs, Linens Accessibility Entire unit located on ground floor Room Amenities Non-feather pillow, Clothes rack, Socket near the bed Pool and Spa Pool towels, Pool with a view, Heated pool Physical distancing Single-room AC for guest accommodation Cleanliness & disinfection Hand sanitizer
Double or Twin Room - Disability Access Room Type: Twin/Double Room Size: 21 m² 1 King bed(s) Bed 2 Twin bed(s) Bed	Food & Drink Tea/Coffee maker, Bottle of water Bathroom Toilet, Toilet paper, Hairdryer, Walk-in shower, Towels, Shampoo, Free toiletries, Private bathroom, Body soap, Bathtub or shower, Shower General Carbon monoxide detector, Key card access, Private entrance, Key access, Tile/Marble floor, Trash cans, Air conditioning, Soundproof, Safe, Smoke Alarm, Hardwood or parquet floors Media & Technology Radio, Telephone, Flat-screen TV, TV, Cable channels Living Area Desk, Sofa Outdoors Patio, Outdoor furniture, Outdoor dining area View Mountain view, View Services Wake-up service Kitchen Electric kettle Bedroom Wardrobe or closet, Childrens' cribs, Linens Accessibility Emergency cord in bathroom, Entire unit located on ground floor, Entire unit wheelchair accessible, Roll-in shower, Toilet with grab rails, Adapted bath, Shower chair, Raised toilet, Lower sink Room Amenities Non-feather pillow, Clothes rack, Socket near the bed Pool and Spa Pool towels, Pool with a view, Heated pool Physical distancing Single-room AC for guest accommodation Cleanliness & disinfection Hand sanitizer
Double or Twin Room with Garden View Room Type: Twin/Double Room Size: 20 m² 2 Twin bed(s) Bed 1 King bed(s) Bed	Food & Drink Tea/Coffee maker, Bottle of water Bathroom Toilet, Toilet paper, Hairdryer, Towels, Shampoo, Free toiletries, Private bathroom, Body soap, Bathtub or shower, Shower General Carbon monoxide detector, Key card access, Key access, Tile/Marble floor, Trash cans, Air conditioning, Soundproof, Safe, Smoke Alarm, Hardwood or parquet floors Media & Technology Radio, Telephone, Flat-screen TV, TV, Cable channels Outdoors Balcony, Outdoor dining area, Outdoor furniture Living Area Desk, Sofa View Mountain view, View, Garden view Services Wake-up service Kitchen Electric kettle Bedroom Wardrobe or closet, Childrens' cribs, Linens Room Amenities Non-feather pillow, Clothes rack, Socket near the bed Pool and Spa Pool towels, Pool with a view, Heated pool Physical distancing Single-room AC for guest accommodation Cleanliness & disinfection Hand sanitizer
Twin Room with Balcony Room Type: Twin Room Size: 17 m² 2 Twin bed(s) Bed	Food & Drink Tea/Coffee maker, Bottle of water Bathroom Toilet, Toilet paper, Hairdryer, Towels, Shampoo, Free toiletries, Private bathroom, Body soap, Bathtub or shower, Shower General Carbon monoxide detector, Key card access, Key access, Tile/Marble floor, Trash cans, Air conditioning, Soundproof, Safe, Smoke Alarm, Hardwood or parquet floors Media & Technology Radio, Telephone, Flat-screen TV, TV, Cable channels Outdoors Balcony, Outdoor dining area, Outdoor furniture Living Area Desk View Mountain view, View, Garden view Services Wake-up service Kitchen Electric kettle Bedroom Wardrobe or closet, Childrens' cribs, Linens Room Amenities Non-feather pillow, Clothes rack, Socket near the bed Pool and Spa Pool towels, Pool with a view, Heated pool Physical distancing Single-room AC for guest accommodation Cleanliness & disinfection Hand sanitizer
Double Room with Balcony Room Type: Double Room Size: 17 m² 1 Queen bed(s) Bed	Food & Drink Tea/Coffee maker, Bottle of water Bathroom Toilet, Toilet paper, Hairdryer, Towels, Shampoo, Bathtub, Free toiletries, Private bathroom, Body soap, Bathtub or shower General Carbon monoxide detector, Key card access, Key access, Tile/Marble floor, Trash cans, Air conditioning, Soundproof, Safe, Smoke Alarm, Hardwood or parquet floors Media & Technology Radio, Telephone, Flat-screen TV, TV, Cable channels Outdoors Balcony, Outdoor dining area, Outdoor furniture Kitchen Electric kettle, Refrigerator Living Area Desk, Sofa View Mountain view, View Services Wake-up service Bedroom Wardrobe or closet, Childrens' cribs, Linens Room Amenities Non-feather pillow, Clothes rack, Socket near the bed Pool and Spa Pool towels, Pool with a view, Heated pool Physical distancing Single-room AC for guest accommodation Cleanliness & disinfection Hand sanitizer
Double or Twin Room with Mountain View Room Type: Twin/Double Room Size: 20 m² 1 King bed(s) Bed 2 Twin bed(s) Bed	Food & Drink Tea/Coffee maker, Bottle of water Bathroom Toilet, Toilet paper, Hairdryer, Towels, Shampoo, Free toiletries, Private bathroom, Body soap, Bathtub or shower, Shower General Carbon monoxide detector, Key card access, Key access, Tile/Marble floor, Trash cans, Air conditioning, Soundproof, Safe, Smoke Alarm, Hardwood or parquet floors Media & Technology Radio, Telephone, Flat-screen TV, TV, Cable channels Outdoors Balcony, Outdoor dining area, Outdoor furniture Living Area Desk, Sofa View Mountain view, View Services Wake-up service Kitchen Electric kettle Bedroom Wardrobe or closet, Childrens' cribs, Linens Room Amenities Non-feather pillow, Clothes rack, Socket near the bed Pool and Spa Pool towels, Pool with a view, Heated pool Physical distancing Single-room AC for guest accommodation Cleanliness & disinfection Hand sanitizer
Double Room with Garden View Room Type: Double Room Size: 16 m² 1 Queen bed(s) Bed	Food & Drink Tea/Coffee maker, Bottle of water Bathroom Toilet, Toilet paper, Hairdryer, Towels, Shampoo, Free toiletries, Private bathroom, Body soap, Bathtub or shower, Shower General Carbon monoxide detector, Key card access, Key access, Tile/Marble floor, Trash cans, Air conditioning, Soundproof, Safe, Smoke Alarm, Hardwood or parquet floors Media & Technology Radio, Telephone, Flat-screen TV, TV, Cable channels Living Area Desk, Sofa View View, Garden view Services Wake-up service Kitchen Electric kettle Bedroom Wardrobe or closet, Childrens' cribs, Linens Room Amenities Non-feather pillow, Clothes rack, Socket near the bed Pool and Spa Pool towels, Pool with a view, Heated pool Physical distancing Single-room AC for guest accommodation Cleanliness & disinfection Hand sanitizer
Double or Twin Room with Garden View Room Type: Twin/Double Room Size: 19 m² 1 King bed(s) Bed 2 Twin bed(s) Bed	Food & Drink Tea/Coffee maker, Bottle of water Bathroom Toilet, Toilet paper, Hairdryer, Towels, Shampoo, Free toiletries, Private bathroom, Body soap, Bathtub or shower, Shower General Carbon monoxide detector, Key card access, Key access, Tile/Marble floor, Trash cans, Air conditioning, Soundproof, Safe, Smoke Alarm, Hardwood or parquet floors Media & Technology Radio, Telephone, Flat-screen TV, TV, Cable channels Living Area Desk, Sofa View View, Garden view, Pool view Services Wake-up service Kitchen Electric kettle Bedroom Wardrobe or closet, Childrens' cribs, Linens Room Amenities Non-feather pillow, Clothes rack, Socket near the bed Pool and Spa Pool towels, Pool with a view, Heated pool Physical distancing Single-room AC for guest accommodation Cleanliness & disinfection Hand sanitizer
One-Bedroom Apartment Room Type: Apartment Room Size: 42 m² 1 Full bed(s) Bed 1 Sofa bed Bed	Food & Drink Tea/Coffee maker, Bottle of water Bathroom Toilet, Toilet paper, Hairdryer, Towels, Shampoo, Bidet, Free toiletries, Private bathroom, Body soap, Bathtub or shower, Shower General Carbon monoxide detector, Key card access, Private entrance, Key access, Tile/Marble floor, Trash cans, Air conditioning, Iron, Fire extinguisher, Soundproof, Safe, Smoke Alarm, Ironing facilities Media & Technology Radio, Telephone, Flat-screen TV, TV, Cable channels Kitchen Microwave, Stovetop, Kitchenware, Kitchenette, Coffee machine, Dining table, Cleaning products, Toaster, Refrigerator Living Area Sitting area, Sofa, Dining area Outdoors Patio, Outdoor furniture, Outdoor dining area View Mountain view, View, Garden view, City view Services Wake-up service Bedroom Wardrobe or closet, Childrens' cribs, Linens Accessibility Entire unit located on ground floor Room Amenities Non-feather pillow, Clothes rack, Sofa bed, Socket near the bed Pool and Spa Pool towels, Pool with a view, Heated pool Physical distancing Single-room AC for guest accommodation Cleanliness & disinfection Hand sanitizer
Deluxe Double or Twin Room with Pool Access Room Type: Twin/Double Room Size: 22 m² 1 King bed(s) Bed 2 Twin bed(s) Bed	Food & Drink Tea/Coffee maker, Bottle of water Bathroom Toilet, Toilet paper, Hairdryer, Towels, Shampoo, Bathtub, Bidet, Free toiletries, Private bathroom, Body soap, Bathtub or shower General Carbon monoxide detector, Key card access, Key access, Tile/Marble floor, Trash cans, Air conditioning, Soundproof, Safe, Smoke Alarm, Hardwood or parquet floors Media & Technology Radio, Telephone, Flat-screen TV, TV, Cable channels Living Area Desk, Sofa View Mountain view, View, Pool view Services Wake-up service Kitchen Electric kettle Bedroom Wardrobe or closet, Childrens' cribs, Linens Outdoors Terrace, Outdoor furniture, Outdoor dining area Room Amenities Non-feather pillow, Clothes rack, Socket near the bed Pool and Spa Pool towels, Pool with a view, Heated pool Physical distancing Single-room AC for guest accommodation Cleanliness & disinfection Hand sanitizer
Superior Double or Twin Room with Terrace Room Type: Twin/Double Room Size: 24 m² 3 Twin bed(s) Bed 1 Twin bed(s) Bed 1 King bed(s) Bed	Food & Drink Tea/Coffee maker, Bottle of water Bathroom Toilet, Toilet paper, Hairdryer, Walk-in shower, Towels, Shampoo, Bidet, Free toiletries, Private bathroom, Body soap, Bathtub or shower, Shower General Carbon monoxide detector, Key card access, Private entrance, Key access, Tile/Marble floor, Trash cans, Air conditioning, Fire extinguisher, Soundproof, Safe, Smoke Alarm, Hardwood or parquet floors Media & Technology Radio, Telephone, Streaming service (like Netflix), Flat-screen TV, TV, Cable channels Living Area Desk View Mountain view, View, Pool view Services Wake-up service Kitchen Electric kettle Bedroom Wardrobe or closet, Childrens' cribs, Linens Outdoors Terrace, Outdoor furniture, Outdoor dining area Accessibility Entire unit located on ground floor Room Amenities Non-feather pillow, Clothes rack, Socket near the bed Pool and Spa Pool towels, Pool with a view, Heated pool Physical distancing Single-room AC for guest accommodation Cleanliness & disinfection Hand sanitizer
Studio with Terrace Room Type: Studio Room Size: 32 m² 1 Twin bed(s) Bed 1 King bed(s) Bed	Food & Drink Tea/Coffee maker, Bottle of water Bathroom Toilet, Toilet paper, Hairdryer, Walk-in shower, Towels, Shampoo, Bidet, Free toiletries, Private bathroom, Body soap, Bathtub or shower, Shower General Carbon monoxide detector, Key card access, Private entrance, Key access, Tile/Marble floor, Trash cans, Air conditioning, Fire extinguisher, Soundproof, Safe, Smoke Alarm, Hardwood or parquet floors Media & Technology Radio, Telephone, Streaming service (like Netflix), Flat-screen TV, TV, Cable channels Kitchen Microwave, Stovetop, Kitchenware, Kitchenette, Dining table, Electric kettle, Refrigerator, Toaster Living Area Sitting area, Desk, Dining area View Mountain view, View, Pool view Services Wake-up service Bedroom Wardrobe or closet, Childrens' cribs, Linens Outdoors Terrace, Outdoor furniture, Outdoor dining area Accessibility Entire unit located on ground floor Room Amenities Non-feather pillow, Clothes rack, Socket near the bed Pool and Spa Pool towels, Pool with a view, Heated pool Physical distancing Single-room AC for guest accommodation Cleanliness & disinfection Hand sanitizer
Studio with Terrace Room Type: Studio Room Size: 32 m² 3 Twin bed(s) Bed 1 Twin bed(s) Bed 1 King bed(s) Bed	Food & Drink Tea/Coffee maker, Bottle of water Bathroom Toilet, Toilet paper, Hairdryer, Walk-in shower, Towels, Shampoo, Bidet, Free toiletries, Private bathroom, Body soap, Bathtub or shower, Shower General Carbon monoxide detector, Key card access, Private entrance, Key access, Tile/Marble floor, Trash cans, Air conditioning, Fire extinguisher, Soundproof, Safe, Smoke Alarm, Hardwood or parquet floors Media & Technology Radio, Telephone, Streaming service (like Netflix), Flat-screen TV, TV, Cable channels Kitchen Microwave, Stovetop, Kitchenware, Kitchenette, Dining table, Electric kettle, Refrigerator, Toaster Living Area Sitting area, Desk, Dining area View Mountain view, View, Pool view Services Wake-up service Bedroom Wardrobe or closet, Childrens' cribs, Linens Outdoors Terrace, Outdoor furniture, Outdoor dining area Accessibility Entire unit located on ground floor Room Amenities Non-feather pillow, Clothes rack, Socket near the bed Pool and Spa Pool towels, Pool with a view, Heated pool Physical distancing Single-room AC for guest accommodation Cleanliness & disinfection Hand sanitizer
Superior King Room with Jacuzzi Room Type: Double Room Size: 24 m² 1 Twin bed(s) Bed 1 King bed(s) Bed	Food & Drink Tea/Coffee maker, Bottle of water Bathroom Toilet paper, Hairdryer, Slippers, Towels, Shampoo, Body soap, Bidet, Spa tub, Free toiletries, Private bathroom, Bathrobe, Bathtub or shower, Shower General Carbon monoxide detector, Key card access, Private entrance, Key access, Tile/Marble floor, Trash cans, Air conditioning, Fire extinguisher, Soundproof, Safe, Smoke Alarm, Hardwood or parquet floors Media & Technology Radio, Telephone, Streaming service (like Netflix), Flat-screen TV, TV, Cable channels Activities Hot tub Living Area Desk View Mountain view, View, Pool view Services Wake-up service Kitchen Electric kettle Outdoors Terrace, Outdoor furniture, Outdoor dining area Bedroom Childrens' cribs, Linens Accessibility Entire unit located on ground floor Pool and Spa Pool towels, Pool with a view, Heated pool Room Amenities Non-feather pillow Physical distancing Single-room AC for guest accommodation Cleanliness & disinfection Hand sanitizer