I stayed 1 week in this apartment : very good location, 5min next to the subway station, surroundings very nice, next to the museum Reina Sofia and Parque del Retiro also, so the location is the strongest point with this apartment. The house is quite well equipped.
However, the apartment is in the ground floor, with very very small windows, which means few light and bad ventilation ... And there is no doors between the different rooms, only a sliding glass wall to separate the entrance and the bathroom.
Thanks to the host who answered quickly and helped us to come and to find the address easily.