The nearby Metro and numerous other means of transport available will take you a few minutes in the historical center of the city and, if your commitments require it, you can reach easily linked sites in the periphery, the GRA.
From Fiumicino Airport
Take the train to Termini Station A meter then get off at Ottaviano-S.Pietro or bus 64, 40, 492 or 70 and get off at "S.Pietro".
From Ciampino Airport
Take the bus and get to the station of the Metro Line A Anagnina direction Battistini and get off at Ottaviano-San Pietro.
From Termini station
Take Metro A and get off at Ottaviano-S.Pietro buses or No 64, 492 40 or 70 and get off at "S.Pietro".
From Fiumicino Airport
Take the train to Termini Station A meter then get off at Cipro or bus 492, 360-940, 70-913 and get off at Station Cipro.
From Ciampino Airport
Take the bus and get to the station of the Metro Line A Anagnina direction Battistini and get off at Station Cipro.
From Termini station
Take Metro A and get off at Cipro or bus 492, 360-940, 70-913 and get off at Station Cipro.