As elsewhere in the world, visitors are advised not to leave cash and valuables in their hotel rooms but make use of the hotels safe deposit box.
Visitors should also not carry large amounts of cash while walking on the streets.
They should also be careful with handbags and other valuables while in crowded places and busy streets. It is advisable to take a taxi/cab if you are visiting the city after 6pm. Walking alone at night should be avoided. Besides an efficient police force and a special Tourist Police Unit, most hotels employ experienced security personnel.
All in all it is advisable to take precautions as anywhere in the world.