We had a wonderful time in Sergios apartment. The apartment was very clean and the location is absolutely perfect. Only thing we would have liked to know, is the fact that the bed is very small and the bedroom has a window to the stairwell. The window is located at ceiling height, so people are not able to look in, however it is not possible to cover for the light in the staircase which lights up every time someone enters the hallway. If you are not bothered by this, we would definitely recommend this apartment to everyone traveling to Madrid.