Travel with a friend, stay in the main areas, and keep your wallet in a vest pocket or money belt.
Use your common sense as petty crime such as pickpocketing is still a threat.
Don’t carry valuables and ensure that you use the safe at your hotel.
Winters can get extremely cold so make sure you come prepared with warm clothing and lots of it as you may need quite a few layers! Use a hat and a scarf to protect your face as well as warm, non slip boots are a must in winter too.