Room was as expected in terms of size and was nice and clean. The bed is really comfy too and the aircon was brilliant after sightseeing for hours. It was mentioned in another review that the walls are thin - this is definitely true if you have noisy neighbours which we did for 1 night but that's not the airbnb's fault!
The breakfast vouchers for the cafe across the road (1 coffee and croissant each morning) was delicious and a great touch! Location was perfect - away from touristy crowds and usual tourist spots, as well as so close to the main train station, termini, and only a 20min walk from Trevi Fountain. Also worth noting that there's a delicious pizzeria (Pinsere, you have to go) and gelato place (Gelateria La Romana) both only 5min walk from the apartment, a big plus when you don't wanna go far for food.