I stayed in Madrid for one week by myself and I would highly recommend Santiago's place! His place is so nice and so clean! The neighbors were wonderful and I felt very safe there. It is within walking distance to almost everything I wanted to do while in Madrid and near a ton of restaurants! It does have the four flights of stairs, but I wouldn't let this sway your decision! I didn't mind them at all and they're truly not that bad. I would stay here again in a heartbeat!