Anna's flat is far better than it looks in the photos. She's a great, responsive and welcoming host with an absolutely stunning flat. The Testaccio neighborhood is classically Rome and the best place to stay if you'd like to get a sense of living in the city. It's also a short taxi/ride from the major historical attractions / monuments across the city.
The highlight was the Testaccio Market and eating at Mordi and Vai's - the best sandwich shop in the entire city of Rome. It's a must.
If you're driving, parking in the neighborhood is plentiful and cheap, just be prepared to have Euro coin for the machine.