We had a great stay at Alberto's apartment in Madrid. The location is great; close to Puerta del Sol and the surrounding city center. The apartment is a little cramped for a family of 5 adults, but we made do. As many of the other guests mentioned, the slanted walls can be a little jarring upon arrival, but we got used to it and spent most of our time outside of the apartment anyway. The bathroom is also small, but functional. If space and claustrophobia is an issue for you, I would probably think twice; otherwise, this is a convenient spot to stay in Madrid.