I refuse to allow instant booking, I want to have some idea what the guest group comprises, especially in one listing which can host up to 12 guests. So far I've had no reason to decline except where people want to hold weddings!
I read on another thread here that to keep your listing near the top is to tweak it every 3 weeks. Either change/add photos, change description slightly, add something e.g. hair dryer. Posting a photo of
my grandchildren's cot in my spare bedroom got me a heap of bookings, so much so that I may delete that photo while I have a breather 🙂