(sorry if I'm repeating from location bit)
This is a great area for exploring Madrid - great walks to restaurant and bars in Chueco and Malasana, and also to the museums. We found it a bit noisy at 2am when things closed around us and in the street - but that's the price you pay for being in the heart of things. Luis and David were superb hosts - welcoming us on day 1, giving us some handy tips and recommendations for the area and sorting out a cab for us when we left.
All in all - a really personal service from a small company, which I'd normally only expect to get when people are renting out their one and only homes.. the guys are good!! We had to move to another apartment in Malasana because there were problems with the boiler.. replaced with a new one when we were there, so don't worry about that!) and that was really fantastic too!