Italy like most of the world have numerous broadband providers, one thing Italy has that many countries don't have though is a wireless/mobile broadband that is reliable, covers most of the country and does not need a landline.
Linkem is the main provider of this type of internet.
You can sign up online or in any phone shop in Italy, its quick and simple, and it takes a couple of days for the equipment to be installed, you may need an antenna installed. You will be able to see this when you sign up.
https://www.linkem.com/ If you use this customer code CBD2529 you get a month free.
The site is in Italian you might need to use Google translate, but its relatively simple. You will then get a phone call from your local installer, I just didn't answer, searched the telephone number on google, then emailed them about it, was easier than me trying to understand what they was saying on the phone.