My wife and I spent four nights at Nader's apartment at the beginning of December. As he was away he arranged for his colleague Jose to pick us up at the airport and he was there waiting for us. We were at the apartment within 30 minutes. The apartment is located in a secure building 5 minutes walk from the Plaza Espana. The rooms themselves were clean, nicely decorated and contain everything you may need including wi-fi, dinnerware and cooking utensils. As Nader has stated the surrounding area is well stocked with supermarkets, bars and cafes and the Gran Via is minutes away. You can buy tour tickets in the Plaza Espana which itself is only two Metro stops from Sol. In other words, a perfect location, quiet apartment but minutes from the buzz of the city. Nader, despite being away, responded promptly to our emails and we always felt that he was looking out for us. I would heartily recommend the apartment to anyone visiting the city