Getting the bathroom clean. I have white tiles and a black dog. The floor is barely ever completely fur-free, even though the dog isn’t even allowed in there. Also, I make sure the house is aired out and (ideally) smells like cookies. I’m sensitive to the smell of other homes, so I automatically assume everyone is like me. I bet they will love staying with you, and would return even if you served them boiled tuna twice a day.