Perfect location, near from the Metro and several bus lines, and you can just walk to most of the major monuments (Trevi fountain, Victor-Emmanuel II memorial, Pantheon, ...)
The apartment can easily accommodate 4 people, event if the bathroom is quite small. It has free wifi, which is always great when traveling.
Fabrizia was very nice, she answered all our questions very quickly.
I will recommend this place to my friends.