The flat il well located, crossing the Buen Retiro park (open till 23) is possible to reach Plaza Mayor on foot in about 20 min. The apartment in very clean and although small enough, nothing is missing. From the point of view of hi fi and home appliances, I've never seen one so gifted.
Unfortunately, the flat being on the ground floor and not having good exposition, is not bright. However all the positive features described above, make this aspect in the background.