Thanks a lot, David, for your hospitality. I profited a lot from your advice about the best addresses in your city district. The apartment is extremely well situated both in a very fascinating part of Madrid and also in walking distance to the city center. Only 10 minutes walk to the center (Puerta del Sol). There was not really a need to buy a multi-day Metro ticket, as all important tourist sites can be reached by a convenient walk. Also I liked your apartment a lot; my room was very spacious - aah, the luxury of lying in the double bed all alone. And also very important: despite the fact that the apartment is so centrally located, it is very quiet.