Luz and Silvio's apartment is truly an excellent place for anyone traveling to Madrid. They are wonderful, caring hosts--communicating promptly if we had a question and providing information about the city. They gave us detailed explanations of how to reach the apartment when we arrived and they helped us find a [big enough] taxi when we left.
The location is ideal--near the center but on a smaller, quieter street. There is a small grocery store right across the street (larger supermarkets about 15 minutes walking distance) and 2 metro stops each a block away, providing access to museums and parks. Shopping districts are within walking distance or a short metro ride. The airport and two large train stations are also easily available from these metro stops.
We would love to come back and stay at Luz and Silvio's apartment anytime!