When you arrive in Airport Fiumicino you can take a taxi which will cost about € 50,00 or you can take a train directly to central station Termini , and when you arrive you take a metro (underground linea"A") direction to Battistini . Exit at Ottaviano-San Pietro stop, and in the corridor of this metro stop take exit "D" (last exit on the right, first stairs on the left . The San Pietro Rooms are in front of this exit.