We stayed @ "Flat for Real Experts at Colosseum" for four nights - the flat is quite small but lovely, very clean & sufficient for our needs.
a. Bed Mattress & Sheets were comfortable -"which I'm very particular of"
b. Shower - with hot & cold plus the water pressure was great
c. Location - very accessible to everything; "Metro (Cavour) - about 2 minutes walk , the Colosseum & Roman Forum, restaurants & gelaterias
d. the Host Alessandro - was quick in replying queries (emails, airbnb messages) & was helpful & welcoming (he was there to met us @ his flat).

Summing up, it was a great experience staying @ one of Alessandro's flats.