We stayed at Sofia's apartment for 3 nights. It's definitely a cozy accomodation: a small living room, with fully equiped bathroom and kitchen on the left and a bedroom on the right.
The position is strategic: you can reach by walk the city center, moreover there is the CHUECA Metro Station 3 minutes walking from the palace where the apartment is located.
You also have 2 markets (Dia and Supercor) nearby and do not miss to visit the San Anton Market!
You can contact Sofia for everything you may need: she is really
helpful and the bookshelf in the bedroom is full of interesting books and tips about Madrid and Spain!