Flavio's place is a great place to stay should you visit Rome. The apartment is clean, in good quality, and a good price.
It is very close to the main metro line (Termini station and Vatican), close to the Colosseum, the Scala Santa, San Giovanni in Laterano basilica and Via Merulana. There are also busses that take you straight to Piazza Venezia, Piazza Navona and Campo de' Fiori.
Flavio was also very helpful and kind, giving us many tips for our trip. We definitely recommend this apartment and will definitely recommend it to my friends should they go to Rome for a visit!