Koper is a relatively smaller city compared to others in Slovenia, and is considered to be one of the safest destinations to visit. As with any city, it is always advised to stay vigilant, especially during night. But the crime rate is quite low and you would rarely, if ever, hear of violent incidents directed at tourists. The locals are friendly and willing to help tourists. Always keep the emergency numbers handy and have the address of your accommodation with you. The city respects all cultures and locals are used to tourists from all over the world. It is generally safe for solo female travelers.