Customising the availability of Instant Book would allow a lot of hosts to take more advantage of this feature
Response from Airbnb
Thank you for your feedback on Instant Book. Your specific suggestion to limit Instant Book to certain calendar dates isn’t in our plans yet, but we’re always experimenting with new options to help hosts better manage their listings. We’re currently exploring some new features that may help provide more flexibility around managing your booking calendar, but we’re not ready to roll anything out quite yet. We’ll keep you updated as we continue looking into how to make calendar management more user friendly for hosts.
In the meantime, this article provides some information on which settings you can adjust to help you control the reservations you get through Instant Book.
Thanks for helping us build with hosts in mind and for your patience as we balance these ideas with other improvements we’re making to Airbnb.