No duvet, for a start. I take the duvet off in the morning and fold it up in the living room, just have pillows n sheets. I change the sheets after each client, and the pillows when needed (when they stop looking and/or smelling fresh). I never iron sheets, they usually look fine just from being hung up. And I don't hang them outside - just on a drying rack in the house.
Oh, and I use cheap stuff. No point wasting good stuff on clients. I've had to throw away several sheets because of nasty stuff that either wouldn't wash off, or I didn't want to try!