I am not sure if this issue pertains to Air BnB rentals, but imagine it should. I own several rental properties (not ABNB) and have written into my rental agreements that tenants will not have above-ground pools, trampolines, and/or open fires. This is because in my neck of the woods children tend to wander through everyone's yards without constraint, and if you happen to have one of these contraptions, they tend to use them without permission. So, G_d forbid if a kid falls into a pool and drowns or breaks a bone on the trampoline, guess who will be sued? NOT the tenant, but YOU the owner! Remember, most insurance companies require a minimum height fence around a pool's circumference with a locked gate, a safety barrier net around the trampoline, and don't get me started with having a fire pit.
This issue falls under the "Attractive Nuisance Doctrine". (The attractive nuisance doctrine applies to the law of torts in some jurisdictions. It states that a landowner may be held liable for injuries to children trespassing on the land if the injury is caused by an object on the land that is likely to attract children.)
So, if you have any of these items, beware.