A few minutes by foot to Valle Aurelia Station on Metro Line A. Best way to come from the airport is by COTRAL bus from Fiumicino Airport outside Terminal 2. The ticket was 3.40 Euros - if you buy from the news stand in Terminal 2, or 7 Euros directly from the driver - to Cortina Station and then purchase a metro ticket for the 2 stops to Valle Aurelia. It was a lovely 90 minute trip by bus thru the countryside north of the airport.
My mother in law wanted to visit the Vatican which was the purpose of our trip. Mauro and Federica kindly got us free tickets for the Papal Audience on Saint Peter's Square, usually a weekly event on Wednesdays. They were very attentive overall ... a minor fuse problem was quickly resolved. Remember there is an additional 3.50 Euro Rome City Tax applicable per person and per night. They will collect the amount when you arrive.