Me and my wife spent eight nights in David's apartment in the end of December and beginning of January. When we got to Madrid we had to get the key from a nearby restaurant from David's friend - everything went very smoothly. The apartment is spacious and homely, the wi-fi is fast, and we really liked the neighbourhood. Lots of good restaurants and bars nearby, and the market hall just opposite the apartment. It is easy to walk to all the big art museums. We had a good sleep, too (except the New Year's Eve night, but then everybody was awake). A comfortable place to stay.