The apartment was great. It's beautifully decorated and has a fantastic use of space.
Location is perfect for a first-time visitor of Rome, as you are in the centre of the city, near all the major attractions and basically in front of the Colosseum. There are many restaurants, bars and shops around and we were able to buy food, water, whatever, even at late hours.
Although there are bars and restaurants in the same street, the apartment was silent enough and we could sleep pretty well. (and we have two small children, which would have waken up if there was noise).
Amenities were really good. Heating functioned appropriately. The kitchen is well equipped, allowing us to cook and eat at the apartment, there is a tv, which we did not use and they even left us soap and shampoo, as if it was a hotel. It's great. Towels were clean, bedsheets and pillows were clean, so overall, a great stay.
Only downsides were a bit of dust - and I'm allergic, so I got a bit sneezy - and a clogged shower sewer, which they will probably have fixed before the next guest arrives.
I would definitely recommend the place and will contact them again on my next trip to Rome.