@Bart254 "the fact that it does indeed impact me in a hugely negative way (I cannot see how you can say it doesn't) "
I really don't think guests care that much about the ratings. It doesn't matter to guests whether a place has a 4.5 overall rating or 4.8. They are interested in whether the place looks nice, is in a location they like and the price is right. Guests are more interested in the written reviews, which give actual information than the ratings.
And Mike and Jane are correct- you should never respond negatively to a positive written review, it makes the host look bad to future guests, and serves no purpose. It doesn't help you in any way.
If you want to educate guests about star ratiings, do it privately, by sending them a private message. Are you aware that the guest review form tells guests that 4*s means Good? The guests don't realize they are giving a rating you will be distressed about. It is Airbnb that is responsible for this, not the guests.
Responses appear on your review page, not the guest's and are for the benefit of future guests, to correct misleading or incorrect info or indicate that a legitimate issue mentioned in the review has been corrected.