The flat is extremely well positioned, out of the very busy and noisy part of town, yet, if you would like to walk the Trevi Fountain is about 20 minutes walk, and another 5 minutes to the Pantheon, then you are in the heart of town.
The flat is massive, and the room well proportioned, apart from the kitchen (but that is an inconvenience that Rome faces as a whole), and is very cleaned indeed.
Decoration is good.
The host is very welcoming indeed and very helpful.

The only bit of criticism would be that the flat is on the first floor, and the windows are not insulated enough to stop the traffic noise.