We really enjoyed our stay at Sara's place. The house was very quiet and the neighbourhood was very pleasant and everyone was friendly. The only noise was the occasional sound of an aircraft, but this was not very often. The house was very stylish. We were there over the winter and the apartment was quite cold. Sara did extend the heating hours for us, and after a day or two we were no longer cold. The internet was a bit hit-and-miss but this was not Sara's fault as it was due to the provider, this may not be always a problem. We had internet for 90% of our stay, and when it worked, it was pretty fast. We were a party of three and would imagine it would be a bit of a squash for four. It would be unsuitable for children or any one with mobility problems as the stairs are steep and open. It is also only possible to stand fully upright in the first section of the upstairs sleeping area. The area is very nice, Pigneto has a lively culture of its own with lots of street art and shops in the area. The restaurants in the area were very good (and cheap) and there was lots of choice.
It is about a 45-60 minute walk to the centre of Rome from the house. You could travel there by the local tram which is just 5 minutes walk from the house.
Sinks were a bit of a problem, some didn't drain properly. Also lighting as the downstairs skylight couldn't be opened fully during the day which made the apartment a little dark. It would have been helpful to have had a reading light -- especially if staying in the winter months as we were.
Oh... as visiting Brits we were a little disappointed that there was no electric kettle.