Hi,
I've lived in Bostwana for 4 years. It is a relatively safe place. I never had any bad experience. Some things to watch out for:
Do not drive at night because of the animals, i.e., if you are going out of the city or planning to do trips, safaris on your own.
If driving alone, do not leave your handbag on the passenger seat. It is not uncommon for thieves to smash passenger windows at traffic stop lights (robots as they are called over there) just to grab your purse.