We enjoyed our stay at Fernando and Patricia's. They were very welcoming and also easy to get in touch with before our trip - which is important too! Unfortunately I got sick the second night of our stay, so I ended up staying in the apartment for the rest of the vacation, but they were both very helpful, lending me a thermometer and slippers; Patricia even made me soup, which was very sweet. The room is a bit tight for two people, but if you're out most of the day it probably won't be a problem. Apartment is close to a couple of grocery stores and to the Atocha station. A nice place to stay when you visit Madrid!