I'm travelling to Italy (Naples) with my boyfriend in a couple of months and we need to organize car rental for the trip. My parents told me to 'get comprehensive insurance' / make sure we're covered for everything, but that didn't appear to be an option with any of the major car rental places. Each one seemed to have at least 4-5 types and what they covered you for was unclear.
So, what types of insurance are there for car rentals (as a general rule), and what does each one do?
What kind of level should we go for if we want to be really cautious (i.e. be covered for pretty much everything)?