If you've got bookings happening on AirBnB and need to block out times you're booked on Bookem (or vice versa, or both), here's how to do it.
See this article on AirBnB to find/copy the link to your AirBnB calendar. Once you have it, paste it into your Team Member preferences by going to Settings | Team Members | {your name}, into the iCal import URL. See screenshot below:
Copy to your clipboard your iCal export URL from Bookem on the screenshot below, then import/paste it into AirBnB by following the steps this article on AirBnB.