We have stayed in airbnbs in Rome before, and Andrea's apartment has been the best. The location is incredible. It's exactly where you ought to stay in Rome, with the Piazza Navona, Pantheon, and other major sites within a few steps. Yet it is on a quiet back street and the apartment faces the interior, so you'll have complete silence at night (trust us, this is especially important if you're staying in Rome over a weekend). The apartment is big, with plenty of space to spread out. It is also steps away from one of Rome's greatest and most authentic restaurant experiences: Da Francesco.
Andrea is a great host. We arrived late in Rome as a result of some logistical difficulties returning the rental car at Fiumincino (side note: never rent from Avis in Rome), but Andrea waited outside the apartment for us and was all smiles even though we showed up incredibly late. He was also extremely responsive by e-mail and airbnb messaging, and he even booked us a private driver--cheaper than the taxis' flat rate--to take us to the airport for a very early flight.
5 stars for Andrea and his great apartment in the middle of all the action in Roma.