@The-Mansion11 save your energy disputing this review. Your scores are still quite high. Concentrate on leaving the response and making sure that it doesn't make things worse. I don't see this poor review. If this is private feedback, don't respond. There is no need to drag that out into the light if the guest has left a good enough public facing review. If its not and I just can't view it, I would say:
"So and so was a pleasant guest. We do not offer smoking on our property and perhaps this was a detail missed by so and so before booking. As a result we are concerned that they did not enjoy their stay as much as they might have rated us based on lack of smoking facilities. We strive for all of our guests to feel at home but sometimes a guest is not the perfect fit. Hosts who allow smoking will likely find so and so good company.