@Nathan2012
"the guests took a shower and they notice the water was not running down the plug and instead of (removing there hairs from it) continued to shower."
Is that what the guests (or somebody else in the appartment) told you, or is your assumption ?
Please do understand the difference in claims on "Host Guarantee" (by resolution centre) or "Host protection" (by a form in here: https://www.airbnb.com/d/host-protection-insurance)
As the damage is not in your property, but in that of neighbours:
"Host Protection" pages mention covering:
"Your legal responsibility for damage to common areas, like building entrance halls and neighbouring properties, caused by guests or others"
BTW I noticed your listing is not active at the moment.
Hope this helps,
Emiel