Check, check, check and check again.
I have 2 Air BNB's. I am CONSTANTLY amazed by the amount of people that book accommodation with me and then just completely vanish from all forms of communication. To the point of not answering any form of Comms so I can send entry instructions so they can actually GET INTO what they've booked.
It might just be me, but when I book something, ANYTHING, as a customer, I wanna know that it's all good and done and ready. And I'll print bloody everything. Phones fail, so do iPads, laptops and pretty much anything electronic.
It's called planning and preparation.