This is a fabulous apartment in a very convenient location in Rome. It's two blocks from Termini, if you're taking the train to/from Rome, or if you want to hop on the Metro (which we did to go to the Vatican). There's a great street of restaurants and shops on Via Urbana less than 10 minutes away, and it's only about 25 minutes walk to the Colosseum (we actually walked to the Trevi Fountain and to the Pantheon as well, which are more like 30-40 minutes).
The apartment itself is wonderful - bright and airy, and on the 6th floor so you get nice breezes through the windows. Each bedroom has an air conditioner. The only downside was that the water pressure in the shower wasn't great, but everything else was really nice.
Giulia was great on communication, and arranged for our (very) early morning car to the airport on the day we left.
I recommend this listing very highly - it was one of our best stays on Airbnb!