I could not recommend this place more. The apartment is spacious and beautifully decorated, the main bed and the sofa bed are both extremely comfortable, the kitchen has everything you need to make delicious dinners and, most importantly, the location is perfect. I chose this place because other people had mentioned how central it was and they were right - you really could not have a better location.
You can just walk out of the front door onto beautiful cobbled streets and find a restaurant anywhere. Opposite is a lovely local wine bar called Vino Olio which got a little loud later on into Saturday night but that's to be expected in the centre of town. Otherwise it was very quiet. The Vatican is a 15 minute stroll across the river, the bus to the Colloseum takes 10 minutes and leaves from just around the corner from the apartment, and the Piazza Navona, Campo de' Fiori, Pantheon, Trevi fountain etc are all easy walking distance through Centro Storico and you are always stumbling across other picturesque squares and fountains.
Alessandro and his team were outstanding. They booked our gate to door taxis both ways, took care of transferring our luggage between the main reception and the apartment, recommended vegetarian restaurants for us, were very responsive when we had queries and provided thoughtful touches throughout (olive oil, wine and wonderful Italian biscuits). They really look after you!
This is the perfect place to stay in Rome! I will definitely be back.