I stayed at Carlos's place a few days and this has been one of my best Airbnb experiences ! The apartment is clean, comfy and the bedroom is really quiet (which is not easy to find in Madrid). Also, it's located in the very cool and dynamic Chueca neighborhood which is close to most of Madrid's attractions. So every interesting place is basically within walking distance ! Not to mention that Carlos is a super welcoming and kind host. So I recommend 100% !!