An amazing apartment and great hosts! The communication with Sara was great from the beginning. We were given instructions on how to get to the studio from the airport and Stefano met us there. He showed us everything we needed to know and gave us customized maps which included some of their restaurant recommendations in the neighborhood (Pizzaria Remo and Giolitti have the best pizza and gelato that I have ever had and the locals seem to agree).
The studio was impeccably clean with towels and mini shampoos and soap which was a nice touch. The beds and pillows were really comfortable, which is perfect after a long day of seeing the sights.
Testaccio is a great area with amazing restaurants. It was an authentic Roman experience. The disadvantage is that is about a 30 minute walk from the Colosseum and about the same to the Vatican, but there are buses to both and Stefano and Sara lay out clearly which buses to take. The area is much less 'touristy' and totally worth it. Great value, great location and very nice hosts. Don't look any further!