We were very happy with our experience and had a great 3 days in Madrid! Elsa was very sweet and hospitable, she gave us a map, recommendations on what to see and was all-together very helpful (starting from telling us the best way to reach the apartment). The place had everything we needed, plenty of pillows and blankets and stuff for cooking, the windows opened in the corridor so not much daylight, but since the hall was connected to the outside we still got fresh air. The neighbours were also helpful :) and the location could not have been better.