Place is a few yards from the Trevi Fountain. Great location if you are ok with constantly being in a very crowded area. For walking around in Rome to see the sites, this was a great location. The subway station (Barberini) was about 7 minutes walk but it was closed when we visited and had to take the train at the Spagna station which was a bit further. The best way to get around I found to be the buses, just make sure you purchase your tickets before you board as you can't pay once you board the bus. There is no parking, unless you park in a parking garage.
The streets are extremely busy during the day and very loud. During the night the noise dies down but early in the morning around 6 am the garbage truck comes by and makes tons of noise.
We rented the place in the middle of February and the heat only turned on for the first 2 days and then no heat. The apartment wasn't freezing, but it was uncomfortably cold.
Checking in and out was a breeze and responses was quick from the host.
Place was clean and spacious. Kitchen was supplied with all necessary utensils and dinnerware. We did have to go and get soap and paper towels for the kitchen, but the supermarket was about a 3 minute walk. Very convenient.
The shower was a good size and had excellent water pressure. Space in the bathroom was a bit tight but not too uncomfortable.
I recommend this place to guests that want to be in the middle of it all and don't mind the crowd and early morning wake up call by the garbage truck :).