The apartment was really well located, one block away form Puerta del Sol wich is the most important metro station.
Justina was really nice and the apartment was very comfortable too.
The apartment is for 4 people but if you are looking for privacy is not the best place cause there is a two rooms apt but there isn't a door.
Another thing (Maybe Lustina is already working on it) is that the internet acces did't work very well and cut averytime.
Is a very recommendable place to stay.
Hope to come back madrid Soon!