We stayed for a week for a family holiday (two of us plus three boys 11, 14 and 16). The apartment was great for us - lots of space and nice high ceilings, and we particularly liked the roof terrace for relaxing.
The location was good for us: close to the Metro and lots of bus routes, and especially useful for catching the 7.20am express entry tour of the Vatican Museums! It was easy to walk into the centre too. The gelateria opposite was a great hit with the kids; we had dessert there most evenings.
There's a supermarket only a block away which made food shopping very easy, though only having a small oven in the kitchen restricted our options a little to pasta dishes we could cook on the gas hob.
There was some road noise and the baby in the apartment downstairs cried early most mornings, but I guess you expect noise in a city!
Alice was very helpful, offering to book taxis to and from the airport (though we opted for public transport instead) and providing a welcome package including wine and nibbles.
Overall we had a great stay and would recommend this apartment for families wanting to see Rome.