Warm version
Best when the guest has already messaged you and you want to sound personal.
Hi {{guest_name}}, thanks for reaching out about checkout instructions. list the few actions guests must complete and link to the full guide for details. Ask guests to leave keys and send a quick reply once they are out. Full details are here: {{guide_link}}Why this works
It acknowledges the guest first, answers directly, and moves the detailed instructions into the guide.

