Sergio is a super host, very kind and helpful. The location of the flat is perfect, as Testaccio is a very chilled, not so touristy area, which is still very central ( you can walk to Trastevere but also to Centro storico) and close to the Metro and Train (Piramide/Stazione Ostiense). The flat was very clean and had everything you need. Would definitely recommend and come back any time!