Desserts in Italy are not worth it. If you need a sweet, grab a gelato on the street. Or a lemon ice, which the Italians learned from the Arabs who, remarkably, imported the snow and ice from the Alps.
Tiramisu seems to be a popular Italian dessert. I think it's ok, but I rarely eat dessert anywhere. I had one gelato (coffee) in Italy, and it was disappointing.
The guy who invented Tiramisu in the 1970s has died.