The upsides are that the location is excellent and the people in the building were very quiet. Downsides were the floors were not clean and the couch/futon was seriously filthy looking (brown stains on grey fabric which you cannot see in the photos). My friend and I experienced immediate "allergy" symptoms when entering the apartment which makes me think it dusty/dirty. Walking around madrid we did not have this issue so I suspect it is not related to us being foreigners in general. If the cleanliness improved I think this would rate much higher because of its excellent location.