Just FYI, one can also fly Air Lib Express on this route for €35-80 one-way, depending on the time and date.

While the train is a more memorable experience, at this time of the year, there will be very few hours of daylight on an overnight Paris-Rome ride, with the more scenic areas being passed in the middle of the night.

I personally much prefer to travel Europe on the ground than by air, while on holidays.