I quickly read the posts as I have had a very long couple of days, but even so, wish to pass on something I learned a few weeks ago. Apologies if I misread any post.
When it comes to by-laws prohibiting STHL, a strata can adopt by-laws that limit short-term rental accommodation in their strata scheme, by banning it in lots that are not the host’s principal place of residence.
However, if someone lives in a strata property as their principal place of residence, the by-law has no effect on them. In fact, they will still be able to rent out their premises in part or in whole while they live there, or while they are temporarily away.
In short, the 3 mth rule you describe has no impact on an owner occupier.
When it comes to notification or contacting the short stayer, I would want to keep in touch the owner occupier who would or should inform his/her “guests” of any complaint by the OC. Short termers in my experience have no interest in adhering to recommendations or directives from third parties ie anyone but the “host” or in this case, AB&B.