We enjoyed our stay at Javier's place very much, and I would like to thank him again for being so accommodating with us and our evening flight (which was also delayed), so despite having arrived in the middle of the night, he was very helpful and provided us with all the information we needed about the place itself and the area we were located.
The flat is newly refurbished and looks exactly like in the pictures, and the its location is excellent, it's very close to everything central Madrid has to offer.
Definitely highly recommended!