Pilar and her husband greeted us warmly and made us feel welcome both in Madrid and in the apartment. Also, they gave us a detailed description of the amenities and the local area, including public transportation options and local sights. The apartment was very clean and everything worked well. In addition, because the apartment is on the top (6th) floor, street noise wasn't an issue, and it was quiet at night.
The location of the apartment is excellent--it is steps away from a bus stop and a subway station, which can take you to museums and restaurants in 10-20 minutes. We highly recommend Pilar's apartment for its location, size, and value.