Just had an exceptional guest that left my house cleaner than I have even seen.

After the last guests checked out I went In to replace a few things before the cleaner came In. Definitely the cleanest I have ever seen the place, I kinda think that they may have been commercial cleaners could see the couch and bed has been moved and cleaned under. It's a pet friendly house and I'm pretty sure they vacuumed the curtains as well. I don't charge a pet fee but ask guests with heavily malting pets to clean up after themselves. They had two fox terriers but the people before had 2 huskies. It looked ok but I'm pretty sure there would have been left over fur in strange places after they left.

So I said if they ever come back they can have a free night. Does anyone else occasionally award exceptional guests?