We loved staying at Maurizio's apartment. Communication with Bettina was great--she's prompt in responding. Great location, comfortable beds, and clean apartment.
My only comment is with air-conditioning. It was super hot when we arrived in Rome (95 degrees or so) and the remote for aircon was tucked away in the drawers by the bed making it hard to find. We were then also told to not use the airconditioning below the temperature of 24 degree Celcius, AND there are no fans in the apartment, which honestly doesn't cool the apartment much, especially when you arrive jetlagged and in heavy summer heat. I don't mind if Europeans are strict conservationists with air-conditioning (I believe in saving energy when one can too), but if the use of airconditioning is conditional and **required to not go below a certain temperature, then this should be made transparent in the listing, otherwise, this amenity reads as misleading. Also, there was a large screen outside our windows that gave a very hazy view of Campo di Fiori square and while we received a refund of 60 Euros for it, I suggest other travelers make sure the view is what the listing is advertizing. Also, toiletries like moisturizer in the bathroom and handsoap in the kitchen, not to mention, extra blankets would go a long way in making a traveler's stay comfortable, and these don't cost much.
Other than these, I highly recommend the apartment. Thank you again, Bettina, for this wonderful stay!