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These are basic precautions and travelers are easy targets because they aren't part of the community. You don't have to be paranoid, but make them a habit.
I would also add that you should never stay in a room that has its entrance on the outside of the hotel. I always stay where the room is entered from an interior hallway. My parents were in a room one time that was entered from the outside, and it was just lucky that my Dad is quite an imposing man becuase it took about 1/2 a second for their door to be broken down and a couple of guys to enter the room. He had them curled in a ball on the floor a few seconds later.