Wendy, I love your list. Very proactive and host oriented. = )
After hosting for awhile now, I would add:
21) The price is the price and the offering is what it is. Don't negotiate. After all you do (see #1-20) and the high standard you set don't give in to people who want to "cut a different deal". They are high maintenance and are never satisfied. They rarely give good reviews.
Just my 2 cents - based on a hard learning curve. LOL
Quick question: did you get a handheld steamer or a full size one? Do you mind disclosing the brand if you like it?
Thank you and keep on doin' your magic!