Marcello's place was great. It's in the heart of the Trastevere area. Very lively area day and night, with restaurants and bars and shops on every street. Walking distance to all the major point of interest (Colossume, The Forum Romana, Spanish Steps, Trevi Fourtian, Pantheon, Vatican City...). It does get pretty noisy at night but with the windows closed it muffles out the noise. Also Marcello provides you with ear plugs if need those.