@Laura-Lee4 While to you it's an unfortunate circumstance, to the guest it's a listed amenity that is not working. You are the host, and you make decisions about how to make things right, regardless of what anyone in the Community Center says. I'd provide some kind of refund for the non-working hot tub.
Thank you! We do have one in the master bathroom and she was forewarned before check in that is was working but had acted up all of a sudden. The guest said it would be fine. She also never told me for over 30 hours. I could have done something about it if she would have told me sooner. She just complained instead.