We enjoyed a great stay at Matthia's place. Madrid is a wonderful, lively city and this apartment is very conveniently located between Atocha Station / El Retiro / Museo del Prado in one direction and the city centre in the other. The neighbourhood is very cosmopolitan and we felt we needed to be alert when we went out at night, but we had no trouble at all. The apartment is small but worked fine for us as a couple with a 20-year old son. AC & WiFi worked well. Recommended!