My boyfriend and I arrived in Rome on Christmas day and used that day as a travel day to get up to Venice. We have already booked our train tickets at
www.trenitalia.com. We got an amazing deal and we printed our tickets at the time we purchased them. We were happy to have our train reservation when we traveled from Cinque Terre to Rome on New Year's Eve day. We had to fight for our reserved seats since the train was packed. Christmas decorations and trees were excellent in Venice and we are planning to celebrate this year Christmas in Rome. Have a nice journey and merry Christmas.