Our stay at Andrea's place was great. The location was ideal for the things we had scheduled. We were right near a metro station, a short walk to the Vatican, and close to a grocery store that we stopped at a couple times to get pastries for breakfast and other misc. items.
Andrea's apartment had a lot of thoughtful touches that we really appreciated like a power adapter, iron and ironing board, hair dryer, umbrellas (which REALLY came in handy on our trip), extra blankets, etc. Our trip was in mid May, so we didn't miss having air conditioning at all, especially because the doors that lead out to the patios let in plenty of air.
We did have a couple small hiccups while at Andrea's place (a shower that drained a bit slow and a door knob that kept falling off), but I emailed Andrea and he was very quick to come over and fix the problems.
Andrea was INCREDIBLY responsive which we really appreciated being in a foreign country. He also arranged pick up from the airport for us as well as arranged a ride for us from the apartment back to the airport at the end of our stay (I highly recommend having Andrea organize rides for you)!
The only complaint anyone from our group had is that the beds in one of the smallest bedroom were a little uncomfortable. The rest of our group had no complaints though. I would recommend Andrea's place if you are looking for a convenient location to do some exploring downtown.