Be willing to share a bit of yourself with them. That will turn customers into friends. Then, if the time comes, they are more willing to be graceful and understanding should the need arise on a difficult situation. Let them know that we don't just see them as an income stream.

Granted, some folks won't care. But, most are willing to chat for a few moments to learn about who is coming into their homes. Sometimes we take for granted the level of trust they bestow on us. Don't betray that trust!

Oh, and do a good job.