We had lovely stay at Leslie's "shells room".
The room is at the top floor, so very quiet, spacious and clean. The private balcony is definitely a plus considering the warm Roman nights.
Although the area might seem a bit rough, Piazza Vittorio is a really convenient location if you haven't got a car: it's 10 mins walking distance from Termimi station and 15 from Colosseum and Via dei Fori Imperiali.
Another big plus is the fact that "Fassi", one of the best ice-cream places in town is literally 1 min from the flat. Definitely recommend it!