Nice private room with a nicely equipped private bathroom in a hotel-like (or nice hostel-like) apartment. There are many rooms and there are common areas. The place is in the heart of the city center. You can walk anywhere you want to go and enjoy the vibrant atmosphere of Madrid. Other than this generally very positive impression, I experienced some unpleasant moments because of the slow responses or just ignoring the messages I was sending. You will never meet your host so be prepared for that. The self check in/check out system is super practical when everything goes as planned during your trip. But if some unexpected changes happen and you need to communicate about that the least you will need is a virtual and non responsive host. I think they need to improve that or they should just hire a receptionist. The place is practically already a kind of a hotel, but without a receptionist. Other than that the room itself is very nice and I would definetely go back.