Fantastic location (less than a 10 min walk from Termini station). The flat is large and surprisingly cool, even without the aircon on! The kids loved the beds on the mezzanine levels.
The flat was quiet, even in the centre of Rome. There are lots of restaurant options around and one that is literally next-door. The host was very welcoming and left us a folder with lots of useful information.
Highly recommended. Much better than a hotel for a family stay!