Great apartment. I stayed here for a month when I was in Madrid for work.
Pro’s: The location. Close to metro station Gregorio Maranon with 2 metro lines. It is located in a nice and classy street with lots of bars en restaurants close by. The apartment is very quite. The central air-conditioning works great! Carlos is very helpful.
Con’s: although the apartment is spacious, it has in reality only one bedroom. There is an extra bed in an intermediate room but it gives no privacy. Also the main bed does not feel solid, the bed moves when you turn. Personally I would never buy a wobbly bed, but I got used to it after a few nights.