This is D's grow zone.
Link is below.
Exactly what northern town do you live in.... It does matter..
The plants you want to grow outside will not do well in the northern green /tan areas .
Your climate is very somewhat similiar to mine which means your choices of plants will NOT survive the winter in the ground.
Musa basjoo would work in your zone for it is a cold hardy ornamental.
I use wood chips and mulch to cover the plants.
And some of the other members on the forum use leaves , bags of leaves ,tarps over mulch, heavy layer of yard waste, you can use anything that puts distance from the freezing air above the soil line and the ground.
Youtube has some great videos of methods to overwinter plants....Keyword " overwinter basjoo"
Check out the supplied links.
Italy Interactive Plant Hardiness Zone Map