Cannot recommend this apartment enough. It is beautifully decorated and, while small, has all of the amenities that you could possibly need. The bed was very comfortable. Did I mention the view?! It is a fourth floor walk-up, which gives you a beautiful view over the whole Malasaña neighborhood.
Salvador was extremely communicative, making check-in a breeze. The apartment was very easy to find and the location was beyond perfect - right upstairs from shops and restaurants. HIGHLY RECOMMEND!