Nahuel was an amazing host. He was very quick to respond.
The place is small. You share the place and bathroom with another guest, but they live in another bedroom so there is never a problem. When I was there during January, it was very cold, and I do not believe there was heating.
The keys were a little difficult to figure out, and often got stuck, which was not pleasant if you were in a rush!
The location is very nice. It is close to Atocha station, so we were able to quickly get around the city. It is also close to Park Retiro, and other sites as well.
I would recommend this place for a short stay.