The best host I've ever met on Airbnb. Mattia was really thoughtful, kind, very professional and extremely friendly. Eve though we didn't get a chance to meet irl, Mattia tried to keep in touch with me regularly during our short stay to give us advices in case we want a help. If you have a question, just ask him and he'll be there for you. The apartment was really lovely with air conditioners (really helpful for the hot summer days in Rome), well prepared, very clean, all the details are really though through. You'll get a well prepared guide in Italian or English at the apartment to help you out with the addresses of nearest supermarket, metro stop, etc... The apartment is 4 metro stations away from the train station, 45 minutes of taxi from the airport, and 5 minutes of walking from the nearest metro station.
I highly recommend the apartment, and also Mattia as a wonderful host. I'm also looking forward to staying again in Mattia's accomadations.
P.S: you have to pay (tourist) taxes at your arrival : 3,5€/person/night