We had a great experience at the attico. The apartment is well equipped and Paolo is the best host you can have. He will make the difference, and I can assure you that he and Cristina will do their best to help you in whatever you need, they will answer in a timely manner and you will feel like home. Anything you need to know to make your stay in Rome great, you will get their advise.
The location of the apartment is great, is from a walking distance to all the historical sites. You have also near Termini and Reppublica stations and a bus stop, mini markets to buy groceries, some restaurants and Via Nazionale with a lots of stores nearby. I really think is the best option you can have and truly recommend staying there.