We had a great experience staying in Roberto's place. The apartment was very clean and well kept, and though small it was the perfect size for two people visiting Rome. Roberto had very kindly left us some things in the fridge, and also a guidebook of Rome that turned out to be invaluable. The area is, as advertised, only 15mins walk from the Colosseum and close to a metro station, and we found some lovely restaurants in the area. I would definitely stay here again if I visit Rome in the future.