If I could give this apartment 6 stars, I would! The location could not be better, which gave us the most time to explore all the great parts of Rome. The host was extremely caring and made sure we had the absolute best time we could have. We were shown the best places to eat in the area and throughout the city (definitely ask about Trappizzino in the Trastevere neighborhood, you will not regret it) and given very thorough information about the metro system and walking routes to all the touristy locations we planned to visit.
One big piece of advice I would pass along to anyone interested: ask about getting a private car to take you from the Rome airport to the house. The train takes way too long, and cabs are, at a minimum, 50 euro. The private driver is only slightly cheaper than the cab, but he was very friendly and helpful and gave us a lot of helpful hints for exploring the city, and he got us to our place in about 25 minutes (taking the train involves also taking a metro or bus then walking a bit, and with our luggage, we estimated that would take around an hour and a half).
Overall, great home, great host, great city, but make sure you have at least a week scheduled to visit Rome, 'cuz you can't do Rome in three days!