We only stayed at Cinzia's place over the weekend and it was okay for us, but there are a few things I would like to mention a few things.
The good things: location is really good, the Campo de' Fiori market has a lot of fresh products, places to grab a snack from or get a fresh juice, which is very nice! The apartment overall was comfortable, not very warm, but it got better during the night (we traveled in December). The bedroom is quite comfortable, so we had a good sleep. Also, snacks for breakfast were a very nice touch, so thanks for that! The check-in & communication were also very easy and we had the place explained in detail as we arrived.
Improvement areas: the few kitchen appliances were not very clean, including glasses, plates. The pictures are much nicer than the apartment, which has been modernized, but still quite far from what the pictures show. All the windows have the old buildings next door as a view, so don't expect any view from there.
Overall, not a bad place, just a bit over marketed in my opinion.
Note: The stairs of the last floor are quite steep, old and at an abrupt angle, so I think this should be mentioned in the description in case someone has some physical condition that would make it quite hard to go up on them (it was not our case, but we were surprised by them).