Central location, high ceilings, stylish appartment. If you plan your visit well, you can hit quite a few major attractions and not need to use the public transport.
The apartment was clean, and the AC worked very quietly. We didn't have a car, so parking was not an issue for us, but it might be a problem for others.
This is not UK, so don't expect to find a stocked fridge, or detergent for the washing machine.
All-in-all a great place to stay in Rome.