This is just a reminder that housekeeping/mousekeeping is not considered a tipping position in the Hotel Industry. So you should never feel obligated to tip, just because you read about it on the internet.
Please understand I'm not trying to tell people not to tip - just reminding that this is not the same thing as tipping your bellman or waiter / waitress.
That being said - we usually tip $1.00 per day per person. And we leave it daily because you may or may not always have the same maid.