It's difficult to say anything above and beyond what the other reviews have already mentioned. Every positive review of Mario and his place are completely accurate. He gives great directions to his apartment, the Metro is so close and convenient, and the restaurants in the neighborhood are fantastic; La Margarita and Gelateria Artigianale Siciliana are especially great! Mario himself is a wonderful host, available if you need him but also so quiet you might not even know he's home. Essentially, staying at Mario's place is like having your own apartment in Rome...and it's fantastic!