Good: Good location for getting to most of the top tourist stops in Rome and very close to great food. Hosts were very communicative. Other reviews mention a lot of noise, but this didn't bother us. There was a fan in the closet and we ran it all night and didn't hear noise from the restaurant below the flat. The apartment was clean.
Could be improved: The bed was not comfortable - it was hard and uneven. I was so tired that I still slept pretty well, but my husband (a sensitive sleeper) did not. The washing machine didn't work well, and only one washing tablet was provided. There were no toiletries or washcloths provided, so bring your own! The apartment furnishings are pretty old and some things like the lamp and the washing machine are held together with tape. This didn't affect our stay, but if you are looking for a glamorous apartment (like it seems it seems in the photos), this isn't it.