Today's etiquette advice comes from American Etiquette and Rules of Politeness 1884 (Rand, McNally & Co.):
KEEP ROOM NEAT.
If you are a visitor be careful to keep your room as neat as possible. Do not let garments lie scattered about promiscuously.
I wish I had read that before I promiscuously decorated my hotel room at AWP. This has been your etiquette advice from some old books I found.