She doesn't leave messes, which is not to say she scrubs the house from top to bottom. If your home and children are the same way you left them - or perhaps a little cleaner - then the sitter has done her job. Communicating your housekeeping needs before you leave is ideal so that everyone is on the same page. But don't expect her to want to come back if you leave a to-do list that is less Mary Poppins and more Molly Maid. Good sitters don't allow avoidable accidents to happen, like babies falling out of highchairs. Tumbles happen, but a good sitter will safeguard your child as best she can, ensuring that safety gates stay closed and the like. She'll have respect for your time, and she'll account for your children's time by documenting their activities or simply telling you about them. Discuss her payment, leave her important information, like your contact information, and the way you expect your children to behave before you leave, so there's no doubt as to what's expected - either by you or your sitter.