We had a great stay on Via Guilia, and Frederico was wonderfully communicative. We were met at the door by Laura, and she was lovely and friendly and set us up with no problem. Some pluses of this stay:
Excellent location, within 30 minutes walking distance of anywhere we wanted to visit while in Rome.
Sleek decoration and spacious accommodations with plenty of room for two.
Firm and comfortable king size bed. Large bathroom with great shower and plenty of counter space - even a hairdryer! Ironing board in the closet.
Very quiet, despite being on street level. In fact, we have stayed at other Airbnb's where we didn't consider our heavy luggage and stairs. This unit has only a few stairs to the front door, so big luggage wasn't a problem.
We also felt very safe in this neighborhood, and the cobble stone street had real European charm.
Some hints: vaguely musty smell to the unit, and bring your slippers - the bathroom floor is very cold.
All in all, we'd stay here again!