Aventino is named for the hill which rises up near the Tiber river and is one of the legendary seven hills of Rome. Diagonally opposite at the end of Circus Maximus is the Celian Hill, another of the seven hills. Testaccio is an area to the southwest of Aventino along the bank of the Tiber and is named for the eighth hill of Rome, a man made hill that was built from discarded pot amphorae (testae) in Roman times. In Testaccio you can find great traditional Roman restaurants, and at night the zone is filled with discos.
Aventino and Testaccio are neighborhoods of Rome.
Easy access to Aventino from most areas of Rome. From Termini area take a bus to Piazza Venezia and walk from there to reach Piazza Bocca della Verità.
Testaccio is a short walk from the metro station 1 and there is also a metro line station at the end of Circus Maximus. Near Piramide Metro station is Ostiense railway station, with regular connections to and from Fiumicino Airport. From Piramide you can also get trains to Ostia.