Sergio is a really kind host. He gave us very good informations about Rome and Testaccio. The busstop is directly to the house, so it was a little bit loud late at the night. Otherwise you can directly take the bus to the train to Ostiense and the city of Rome.
The appartment and our room was nice and clean. Only the bed was not the best. Testaccio is a great old area with original restaurants and inhabitants.
We had a good time and can recommend Sergio.