If you really want to alleviate worry and enjoy your trip, make a game plan of what you will do if you come out of your room in the morning and the car is gone. You prepared in advance with the VIN, license #, pictures, contact info all in your phone. If it happens, you will: call the cops, check the tracker, call the insurance company, get an uber ride to the rental car agency, enjoy the rest of the trip. Resign yourself to the possibility of this worst case scenario, accept it, and then you won't worry anymore and enjoy the car and the trip.