1. knock on the door before open with your key
2. open door say hello, excuse me, i will be lending the room for ... nights
3. walk in, take off your shoe, never put it neatly or else just make sure one side face down, the other side face up
4. open the bathroom light and ensure it's open everytime you're in the room
5. if you see any open religious books, don't close it... (this is confirmed by all my hotel working friends- open book room is usually with problems) but if you scare you can go request for room change which usually the staff will understands... certain places you will see baby milk bottles at corner of somewhere in the room (this one usually at thailand) just request to change the room if you see it
6. Everytime you come back to your room after go out... remember to knock your room door before you open and go in to inform them you are back
did number 1 and 2..