Me and my partner stayed for 2 days in the appartment and absolutely loved it. It has everything one needs and the location is perfect - everything is within a walking distance and the area is very vibrant, too. Also, Pau greeted us in the flat with lots of suggestions and tips on Madrid. As we were leaving Madrid on the evening of the second day Pau was very kind to let us stay/leave our luggage until our flight.
Would recommend this appartment for a couple or 2-3 open minded friends willing to explore Malasana and Chueca - wonderful neighbourhoods!