Guys, I've got a week break in France and Italy coming up in May and need to start my planning. Will be in Paris for a couple of days at a friend's place so that's covered but wondering has anyone done the train trip from Paris to Italy? What's it like, etc?

And I know there would be a fair few people in here with kwality first hand info as to where to go once in Italy so hit back with some suggestions.

Will have 5 days there so sleep is optional and time is of the essence.