Doug,
You will love the Roma de la Ville InterCon. Fabulous hotel, service and location (however, I am very, very partial!). Breakfast in the hotel is done very nicely. Service is impeccible.
We arranged, through the Concierge, for a driver to take us to the sights that we were unable to walk to. Our driver, Roberto, did a great job. He also drove us to Tivoli, where we had an incredible lunch at Antico Ristorante Sibilla - OUTSTANDING!
Borghese Gardens is lovely and a great place to wander. This is very close to the hotel and a nice option on a day you want some serenity.
Have a wonderful time!