It is perfectly safe for tourists at the vast majority of sites in Italy. Italy is like most other countries that receive large numbers of tourists. Most areas are very safe, although some areas may be more prone to crime than others. Basic common sense travel advice applies in Italy just as it would apply somewhere else. Be more careful at night. Be more careful in places where there are fewer tourists. Try to blend in if you can. It is always a good idea to be less flashy and conspicuous while traveling, especially in out of the way areas.