The crime rate in Turkiye is actually less today than in the past. Having said that, locking valuables in safes at the hotel is always a good idea, it’s better to be safe than sorry. Some areas of Istanbul can feel a bit dodgy at night, take care in the Taksim area at night. Some pick-pockets have been known to work around the train stations, so some extra attention is advised. Keep an eye on your bags and keep your wallet in a safe, hard to reach place. Insmaller cities the crime rate is so low that it is not even worth mentioning. One can totally relax and mingle with the local population without safety worries. In small villages crime is almost unheard off.