You only have to clean the bathroom once, or pick up the room once, clean the floor once,
You are wrong there.........they clean it twice. They clean it in the morning after you have left the cabin - make the beds, dust and vacuum the room and clean the bathroom leaving fresh towels etc. Then after you leave for dinner, the clean the bathroom again & leave fresh towels, etc, vacuum again and then turn down the beds, leaving a chocolate on each pillow - yummy.
As previous posters said, tipping is very subjective and it's your call as to what you want to do.
Have a great time.