Its not a rental nor AirBNB. Its friends of the owners. I don't want to be a racist homophobe.
We recently had a barking dog issue in our neighborhood. While the complainer is now shunned by the neighbors, the rest of us benefitted greatly.
I've seen politeness be taken for weakness, and attempts to escalate from there not taken seriously. This guy went in hot and heavy on first approach, problem solved.
Your issue is different, there is an end in sight. If they're friends of the owner, a friendly word or two may suffice. Is he there now, or did he leave and let his friends use it while he was gone?