As you might expect, given the heritage, Italy is in many ways very cycle-friendly.
"I have driven in Italy a few times and felt sorry for the cyclists that were sharing some of the roads we were using at the time."
This is a comment I hear from people about every country I've ever cycled in. Things look very different from inside a motor vehicle. Notwithstanding that, there are quite a few Italian drivers who live up to the Italian Driver reputation. Mostly, though, it's just perception: riding out of Catania drivers were like a swarm of fruit flies, cheerfully taking to the pavement or the wrong side of bollards, through no-entry signs to avoid being behind a cyclist, but were *extremely* careful never to cut me up. Traffic lights don't count unless there's a man on a box with a uniform and a gun.
I don't have specific info on the area you're going to, but generally there are huge numbers of really good quality cycle routes. You can travel 100s of km without using a road and only occasionally crossing one. They have free water, free wifi, well equipped stopping places (often with free tools) every few km. Some are tarmac, others are fine on 25mm tyres. All have sensible gradients. Nearly all guest houses have somewhere for bikes, often with e-bike chargers.
Provisions can be tricky: "convenience" stores are only open a few hours a day and petrol stations *only* sell petrol, nothing else. Not even water. Thankfully public water taps are all over the place, and usually shown on open street map.