This is tricky, bc you just don't get useful hosting tools for separating ages of guests you want to host on ABB. (vrbo used to let you list a max adult, max child count, but even with that people still got confused)
-so you don't want to say 6 person max, bc then a family like mine with 5 kids wouldn't see you in search.
-but trust me when I say that searching for a place on ABB can be an exercise in frustration. and people don't read, and when they do half the time they'd fail a state elementary ed reading comprehension test, so don't necessarily take a freak out as somehow being your fault.
I think your best advice here is: firm up your listing text and photos, to set the scene for the group you're looking for. Our municipality disallows groups over 6 adults that aren't from the same household, so you're in good company to say what works and what doesn't based on that measure, just spell it out very clearly: in the listing text, in the house rules, in the 'things to note' section, in your initial communication, etc, etc. I wouldn't count on making it all the bunkbeds' fault either bc folks will invariably say: oh, we'll sleep on the floor or on the couches or whatever.
Good luck, @David-and-Annie0