Liberty Flat is spacious and pretty. We stayed 3 nights - with our 3 kids. We ate locally twice - walking distance to many good restaurants. While in Rome, a couple of times we walked home, even if it was a mile or so because it is scenic and easy to find and fun to walk back over the bridge to the flat. This is located on the Vatican side of the river. The metro is a 10 min walk or so.
We took it to the Colosseum - you have to change subway train once to get to that side of Rome but really easy to do. A couple of times we needed cabs so we just went down to the street and flagged one down. It didn't take long at all for a cab to come by. Gaia called us a van for a ride to airport. for 5 of us in a van plus 5 large suitcases it was only 60 euro.
Both Melissa and Gaia were very responsive to all inquiries - with quick responses. Melissa met us for check in and showed us around the flat and has a book of recommended restaurants. Overall, I highly recommend Liberty Flat!