I have 300+ reviews on my listing & I’ve asked Airbnb to remove a total of 4 reviews (of course.. good/bad reviews either drive or hurt business!) Airbnb removed only 1 of 4. (That guest left a terrible review, because the guest had somebody on the street “look at them with bad intentions”.. direct quote and I couldn’t forget it because it sounded so ludacris)... Airbnb removed the review because “the review did not describe what I offered as a host, but something entirely outside of my control”.. which I think is fair. but the other 3 Airbnb basically said, screw you, it will stay!
So as a host I’m 1/4 in removing bad reviews, and our rates are between $300-500 a night - so I would honestly say that Airbnb is as impartial as possible- I certainly do not decide which review stay or go.
Bed bugs do sound like an absolute nightmare though. I assure you it is my biggest nightmare as well.. I can’t imagine when that ever happens conveniently, but if a guest brought them into my home I would be pretty upset

hasn’t ever happened knock on wood.
mb