We had a great stay at Frederico's appartement, great location in Rome in a great neighbourhood, and it was a clean and spacious appartment.
However, there was 1 major problem with the location of the appartment in the street: because it is located in an alley, every night people were hanging around the building and were making a lot of noise, usually right below the bedroom windows. And since the windows had thin glass, we haven't had any good night's sleep. Also, there was a shortage of towels, and after communicating this to Frederico we were directed to a cabinet that was locked.
After all we had quite a good stay, and Frederico and Carlo were quite cooperative. If the problems with the noise could be resolved, the appartment is a great place to stay when you are in Rome!