I did this trip a few years ago but it was terribly confusing so I'm hoping for some clarity this year. I need to go from Rome Airport to Viterbo by train. So that means I need to get to the train station from the airport--how is that done, please? And also, I seem to recall that the train we took had an end destination that was not Viterbo, but that Viterbo was one of the stops. Any clarity for this trip would be very much appreciated. Thx.