Costanza's place was awesome! The location is really convenient (a 10-minute walk or so from Termini, Monti, Trevi, and the Spanish Steps). It felt super safe and was very quiet. The air conditioning worked GREAT! The bed was super comfy. I really don't have any complaints!
Also tons of banks/ATMs, cafes, and restaurants within a short walk.
The price for the location was an excellent value. I've stayed in other Airbnb's in Rome that were closer to major tourist areas, but then they're so far from the train station that you have to drag your luggage forever and they're often very noisy.
I would definitely stay here again!