@Stephanie365 "
So you're suggesting I say something like, "Overall, Joe was a good guest; however, he was very quick to ask for discounts for trivial items."
That makes it sound as if something was legitimately wrong, if trivial. If it says in your listing that use of the washer/dryer is only for long term guests, what you need to get across is that he demanded a discount for a non-working amemity that is only offered to long term bookings, when his booking was only for 1 night.
You say you have no way to control a short term guest using the washer/dryer, but there are all kinds of ways you can disable it and hook it up again for a long term guest. It might even be on its own breaker, that you could just shut off.