This apartment is in a terrific location near the coloseum and within walking distance of grocery stores, restaurants and the subway. Josette provided a very comprehensive slide show of tips for Rome (bus and subway routes, restaurant recommendations, grocery stores, recommended attractions to visit, etc.) which was emailed to us before our visit. We were very impressed with this! She also arranged for a car to pick us up at the airport which was invaluable.
The apartment is very modern and clean and the host had juice and snacks for us at our arrival. The air conditioning worked very well and was very quiet. We felt very safe here (electronic rolldown covers for windows and double doors).
The place was very comfortable for my family and I (4 of us).
I'd say the only con of this apartment is that you can hear the sound of the tramway. This didn't really bother us though since we were tired from our long days of sightseeing :)
I would definitely recommend this apartment.