All of the previously mentioned rules apply with city dwellings just as they do with village apartments. Don't get scammed and avoid fishy situations. If you doubt the integrity of someone offering you a room, you're probably rightfully worried. Pass on it in that case. Don't ever risk anything to save a few euros; saving money shouldn't be about risking your life.
"We wander for distraction, but we travel for fulfillment." -Hilaire Belloc