We spent four nights at Rafa's place and much enjoyed it. It's a compact apartment. There were six of us so it was a tight, but doable.
The best part of the place was its location. It's a one minute walk a metro station and a ten minute walk to the Prado, Retiro Park and several other museums.
Lots of good food choices close by too.
Rafa was very responsive, met us at the apartment and helped us via email throughout the trip.