A very nice apartment in a great location, though it is pretty noisy!
The apartment is well-decorated an equipped. The main bedroom is spacious and very attractive. The sofa bed is good quality, but does pretty much fill the living room when it's in bed mode! The little kitchen has a microwave and a hob - no oven but it was more than enough for our needs. We just had breakfast there as there are loads of restaurants nearby.
It's within walking distance of just about everywhere important in Rome except the Vatican and the area around it is really interesting.
The only negative - and we can't blame Piera for it - is that via Cavour is noisy most of the night - both people and traffic. If you're a heavy sleeper this is a 5 star rating!