We stayed at campo de fiori for 3 nights. The apartment was nice and clean, maybe a bit noisy but only because of the market near by and because it's a "drinking" area, so people tent to scream a bit more during the night time. I am from Rome but I wanted to stay in the city to be more central and walking distance from the monuments. It can be very hot without the air conditioning but that's how it is in summer! :)