Gianmarco is the most hospitable host we've had with Airbnb: warm, friendly, excellent communication, and helpful wherever possible.
The room was clean and suitable for folks who are going to be spending most their time in town. A small fridge lets you store drinks, and they very kindly put coffee pods and a small pastry each time they clean (daily, or as desired). The bed is very comfortable. AC is cool but rather noisy; it turns on and off throughout the night and for light sleepers that might not be ideal. All else is very good.
The building is very close to Cipro metro station (A line), from which it is easy to get to Roma Termini, Spanish Steps, Colosseum, etc. It is also super close to the Vatican—if that's your main point of interest, look no further. To get to Campo di Fieri, Piazza Navona, Pantheon the most direct route is by bus: we had terrible luck with the nearby 492 bus. All in all, solid location; in less than scorching heat, we would have walked the whole time.
Thanks very much to Gianmarco for a great first stay in Rome.