Quick answer
Send instructions in chronological order: arrival time, address and landmark, parking, route to the entrance, access steps, lock operation and what to do if something fails.
Write for a tired traveller
Assume the guest is reading on a phone in the dark or rain. Use numbered steps and one image per decision point rather than a long paragraph.
Remove access uncertainty
State which door, floor, gate or lockbox is involved. Test instructions from the street without relying on your own familiarity.
Include a recovery path
Provide a contact method and a simple fallback if the code or smart lock fails. Never publish permanent access codes on a public listing page.
Common questions
When should I send check-in instructions?
Send enough general information in advance, while sharing sensitive access details at an appropriate secure time.
Should I include checkout at the same time?
Link it, but keep arrival steps visually separate so guests can complete the immediate task.