Andrea's place was truly great -- lots of space with four distinct rooms. The bathroom was modern and the water pressure in the shower was fantastic. Andrea was also thoughtful enough to leave us water, a bottle of wine, and a beer in the fridge, plus some treats for breakfast.
Our train arrived to Rome earlier than his check-in time (and it was POURING rain) and Andrea graciously let us come to the apartment early. He also helped us coordinate a tour of the Vatican Museums and St. Peter's Basilica with one day's notice. Communication with Andrea was consistant and quick.
The only negative for us about this place is the location, but this would depend on your preferred method of transport. There were several bus stops nearby, but we chose to walk or use the Metro. The closest metro stop is at least a 10-15 minute walk (which can be difficult with baggage) and a taxi ride from Roma Termini isn't cheap. We ended up walking for most of our trip (over 30 miles walked in three days) because we found it to be easiest and it allowed us to see the most of the City. That being said, you can literally see the dome of St. Peter's Basilica if you walk about 10 steps out the door, so if the Vatican is your priority, then this is perfect for you.