Even though we had expected a private double room - which was probably our fault because I think it was stated on Airbnb - our stay in the dormitory (with 5 bunk beds) was very good. Communication and check-in were easy and we were allowed to drop our luggage in the morning. The host was friendly and helped with any problems/questions.
The whole place is lovely, especially the patio with an area to relax between many plants. Kitchen is small but well equipped for cooking.
We also loved the location because it was in the centre of Madrid and perfect for us to explore the city. Everything was in walking distance: touristic places, supermarkets, restaurants, cute café next to the Airbnb,…
Only “negative” thing to mention is that some of our food in the fridge (like ice cream) was taken despite our names being on it, but I guess that can happen in a place with many people.
Also you have to keep in mind that there are many beds for many young people in this place, so it can be louder at night or crowded in the kitchen. For a few nights we didn’t have a problem with it, but just be aware that you are never alone here ;) which of course can also be an advantage if you want to meet new people!
All in all we would totally recommend this place :)