Great list! I am just getting started so I appreciate reading what others are doing. People do forget things and it's nice to let the guest know you've thought of them. We stayed in our guest studio for a couple of weeks before listing it, helpful to figure out what we might have overlooked.
In the bath:
In addition to what others have said,
I put a stock of the free samples I get whenever I buy cosmetics in the bathroom cabinet and just add whenever I get more. People don't generally take them but they've been used a couple of times.
Small box of kleenex as well as a couple of mini kleenex packs.
We found some cheap toothbrush & mini tube of paste in a packet and I put two in the cabinet each stay. Guests have used those.
The small tubes (I put two bottles in the cabinet each time) of body wash / shampoo, it almost always gets used.
I leave a little sealed packet of paracetamol each time, it has been used twice.
Kitchen:
Sometimes, a bowl of oranges in the refrigerator so they can make juice with the juicer if they want to. Guests have used that, and appreciated it.
I set up a cabinet with the food / cooking basics plus a few things that they can muster up a meal with, and a little bottle of milk in the fridge. I ask them to write down what they've used so that I can re-stock. (They do write things down, which concretises in their mind the value of what they are receiving, I think.)
If I plan to be out and about before their arrival, I message my guests to see if they want me to pick up something for them. One guest asked if it might be ok for me to pick up some cereal. I added a few mini-cereals in their provisions cabinet and have found that guests generally do eat them, and are appreciative.
I put out a tray with coffee pods, tea, sugar bowl and breakfast bowls to encourage them to enjoy instead of having to find it in the cabinets.
For their use: Salad bowl, steamer basket, pasta pot and a smaller pan with lid, good knives, cork screw, full place settings, cloth napkins, one clean sponge in the sink, salt pig and kitchen utensils by the stove like tongs, spatula, spoon for stirring, etc.
A couple of pellets for the dishwasher.
2 dish towels
General:
Luggage rack that fits in closet (it was my mom's idea and people appreciate that)
Ironing board and iron, coat hangers.
Cotton blanket in addition to the duvet.
An empty market basket so they can go to the nearby outdoor market.
Welcome book with House Rules, wifi password written in big letters on its own separate page, and pouches with: public transport map with 2 tickets to get them started, map of the neighborhood with grocery stores and restaurants marked, and a general map offered by the office de tourisme. A pouch with a couple of postcards with envelopes, and 2 stamps good for worldwide postage (that got used twice).
I put a coaster on every piece of wood furniture exactly where it might be tempting to place a cold drink.
Cleaning supplies all stored neatly in their place, easy to reach.
I have been considering a guest book, do you have a guest book?
What I removed after seeing it wasn't useful:
I removed the rug I have an emotional attachment to and replaced it with another one I got at a garage sale. Still pretty, but now I don't worry too much about it.
I removed the pretty coasters that I love and replaced them with pretty coasters I don't mind if they get lost.
I removed the extra set of towels and tell them to let me know if they need more, which cuts down on laundry.