What is your goal with your stay in Rome?  Are you only planning to stay one night and then head to Civitavecchia?  Are you hoping to do any additional sightseeing? (Rome has a lot more to offer than just the Vatican and Colosseum)....   You have to look at the whole picture when planning, especially if you don't want to take a private transfer to the port.   One possibility:  When you arrive at FCO, take the express train to Termini station in Rome. There are a number of rea
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