Massimo and Simonetta's apartment was a perfect place for our stay in Rome. The apartment is spacious and well-stocked, and in a great little residential district near St. Peter's Basilica, with great restaurants and markets very nearby-- we loved the fruit stand close by, as well as the playground for little kids. Simonetta's was so kind to come and pick us up from the metro, and took the time to tell us the best places to visit in the city. She was also very kind to our two year old son,who had had a very long day and was tired. Massimo was easy to communicate with over the weekend too, and responded to texts quickly.
If you arrive at the Roma Termini train station, you can also use the local train to the Roma S. Pietro station for only one euro/ticket, which drops you off just a short distance from the house. Overall, I highly recommend staying at this apartment, and thought that Massimo and Simonetta were fabulous hosts!