@Patricia1556 I don't think there exists a fair way to reduce something as nuanced and varied as hospitality to arbitrary star ratings. But devil's advocate here, if you're a guest who actually has faith in those star ratings, you'd probably prefer a system that didn't sweep 1-star ratings under the rug.
Imagine, hypothetically, a new listing that's not quite ready for prime time. The first 3 guests have a disappointing but acceptable experience, and charitably rate it 5 stars to be nice (you'll find some hosts regard even 4 stars as an act of violence, so that happens all the time). Maybe they each tell the host privately that some things are seriously wrong with the house, assuming it's not worth mentioning in the review because surely they'll be fixed soon anyway. But instead of taking that feedback on board, the host takes those 5's to mean everything is hunky dory as the home falls further into disrepair. Guest 4 arrives to a home with a "perfect" 5 stars and is shocked at the awful condition it's in. Host points to their perfect record as evidence that the guest is the one with the problem. Guest leaves 1 star review. Next guest turns up, and by now the house is just a rotten box of rats and snakes. Another 1 star.
So here's the data set: 5, 5, 5, 1, 1.
Mean: 3.4*
Median: 5*
Which do you think would be more reflective of the most common guest experience?
Of course this story is an exaggeration, but actually I did once give a new listing 5 stars for potential and alerted the host to the issues privately. Sadly, I saw later that subsequent guests had the same problems over a year later. The listing's current mean is much closer to my experience than I rated it.
Anyway, I can tell you're feeling burned by that review from P*******a, and maybe it was a pure, unmerited revenge review. But it would be worth posting a response owning up to whatever went wrong with that stay, and assuring prospective guests that it was an anomaly. As a guest, when I look at reviews, I value consistency over perfection.