Beware of pickpockets as they tend to operate in tourist areas, keep your belongings secure at all times and be careful if strangers try to make conversation or distract you as it could be an attempt to steal your valuables.
Car thieves normally target expensive cars but there are some exceptional situations where rental cars have been broken in to. Park the car in well lit areas and use car park with CCTV. Don’t leave valuables on your car seat as it could attract criminals, drive with the car door locked all times.
Tourists are more of a target in Rome for street crimes such as muggings and pickpocketing. However, taking simple precautions such as using a money belt can make you both safer and also help you feel comfortable.