Before you arrive, Italian law requires us to register every guest with the local police. It takes two minutes. Your details stay private and are used only for the mandatory registration.
It's Italian law: every accommodation host has to report each guest's ID to the State Police. We just do it online so you don't deal with paperwork.
Check out this video for a bit of clarity: youtu.be/HGiYlK5IgEQ
Airbnb also breaks it down here, under the "General regulations and permissions" section. Airbnb's support team is always around if you need more help.