We really enjoyed staying in Andrea's flat and he was a very affable host and responded quickly to communication and our requests (the shower was not full pressure and the shower head and slipped out of its position on the pole--both were resolved quickly!). The flat was very spacious and well equipped. Do watch your head on some of the lower ceiling regions near the stairs, which Andrea has thoughtfully cushioned with foam.
The flat couldn't have a better location! The Colliseum is literally closer than a block away with the metro and taxi stand ridiculously close, too! We loved the area and it was easy to zip in and out to explore other portions of Rome. It felt very safe and was lively at all hours of the night.
Would definitely recommend requesting Andrea's flat if you are visiting Rome!