Housekeeping. You may think your own home is nice and clean, but even if you're an obsessive-compulsive neat freak, hotels play it at an entirely different level. We have to.

For example, do you change and launder your sheets every day? No? But you put fresh sheets on the bed if you're expecting house guests for a few days, on any bed intended for their use, right? And you supply them with fresh towels, not one you used yourself once already. And even then - well, when was the last time you steamed the carpet in your guestroom, or turned the mattress over?
All hotels deal with are house guests.