The flat is very nice, well equipped and spacious. It's situated 10 mins tram / bus ride from Termini and there's a direct bus to Collosseo and another one to the Vatican. We even took a taxi one night to get back to the apartment from the city center after a late dinner (€15 from the Tiber riverbank).
The street can be quite noisy in the evenings but we don't hear much of it in the bedroom, and we slept really well.
It's a very nice neighborhood, a real roman one, with almost no tourists (a real joy after a long day visiting overcrowded roman points of interest). We had a very nice dinner in a small restaurant the next street and there're plenty of nice bars all around to have a drink . The market and small bars to have your coffee in the mornig are also not expensive and quite authentic.
Aurelia and her husband Max are great hosts. We had a transport problem (metro suddenly shut down) and were late for the check-in. Aurelia was very comprehensive and waited for us for more than 30 mins. She gave us all the useful information about the neighborhood and we found lots of maps and guides that we could use in the apartment.