Hi
I'm not specialK, but maybe I can help answer your questions.
We tip every day, as you may not always have the same housekeeper. The usual, or at least what we do since reading it here years ago, is $1/person/day.
Here is a link to some cute "mousekeeping" envelopes, that we print out and fill before we leave.
http://users.adelphia.net/~heidiw/
One less thing to think about! It's so easy each day to just pull out an envelope and place on your pillow, table, wherever.
Hope this helps! Have a fun trip!
Debbie