The apartment has a great location, the neighborhood is great and full of bars and restaurants. It also looks very nice and you have everything you need.
I do have some downsizes, though - the fact that it is on the ground floor and it only has one window that sees the street, so you need to have your curtains closed, makes it very dark. We were there at the beginning of December and the apartment was a little chilly during the morning/say, in the evening/night it was ok.
Anyway, a good choice for staying in Madrid.