Hi @Daniel828. So far I noticed that my google calendar updates my airbnb one, but not vice versa. I guess that the problem is that I do not use that gmail account to log in, but then Airbnb would ask for access to everything, including all contacts, so the price is too high. Exporting to my existing google calendar has not been correct for me yet.
Theoretically, it would need checking if updates appear when you grant airbnb full access to google+, but in my case it would require signing up for a special gmail account only dedicated to airbnb (thanks to their aggressive policy). So I am not considering that option for now.
// "The only person you can trust is yourself"