Katie I love your list and your routine. I have holiday 3 cottages and with a good system we are much less likely to forget something. I use a large clear PVC tub and pack it ready in advance for each cottage with linen, towels, toilet roll, soaps etc. My cleaning kit has things like bin liners and cloths etc.
On change-over day it's all at hand. Ventilate first with all windows open to change the air. I always clean starting the furthest from the door, top to bottom and back to front. That way there is no need to go over anywhere I've already been, and like you, I close the door as each room is done.
Then I just need to pop in at the last minute with some fresh bakery products, homemade jam, milk and fresh flowers.
I'm going to borrow your idea of the welcome book open on the first page. How lovely!
Thanks Julie