This is a very modern apartment in a great location. It is five minutes walk from the Trevi Fountain and 20-25 mins walk from the Colloseum. Hop on Hop Off buses go from near here. There are several excellent restaurants on the doorstep (try Mazze just up the laneway, it is amazing food but you will need to book).
Communication was good with the hosts, and we got prompt replies. The check-in was efficient and we were met at the door. They provided a folder with lots of tips and suggestions, and we used this to find restaurants.
The beds were comfortable, and we got a good nights sleep. They had a washing machine, which was very useful. However, we would suggest they get some new linen and covers for the doonas.
In terms of suggestions, the apartment is not as large as the photos may suggest but still very livable; this was not a deal breaker. Also, there is nowhere to store your luggage when you check out so you will need to find a commercial luggage storage place - shop around for this as some are quite expensive (we would highly recommend The Leaving Room about four blocks away).