We really liked staying in Rosario's apartment. We stayed there with our ten year old son. The apartement is in a quiet street walking distance from all the great places in Madrid. Close to the Metro station, the Prado Museum, the Retiro Parc.
The apartment was clean and neat. Rosario left some milk, bread and other things to eat for us. We came a little later than we were supposed to, but she was there in 5 minutes to let us in. Very kind of her.