We took the cruise line tickets on the express train. This was affordable and convenient, but they didn't really offer much information and the station facilities at that station weren't great. It would have been fine had we planned ahead more, but we kind of winged it in Rome (we'd been twice) and now I wish we'd planned it out better and known what our travel plans from the station around Rome would be.
Read Tijcornell's full Norwegian Epic cruise review
Norwegian Cruise Line