I agree - staying in another Airbnb or even in your own is the best way to realize what may be missing.
I furnish hair dryers in every bathroom, curling irons, flat irons, etc. I also furnish a silicon mat in the bathrooms to protect my bathroom counters from the irons.
Mirrors in areas of makeup, hair, dressing are important. I've stayed in Airbnbs that have one tiny medicine cabinet mirror over a sink with no counter - no place for hair dyer, curling iron, makeup.... no grounded outlet (older home). Quaint is nice but not preferred when it comes to the expected basics.
It's important to put cleaners above 'toddler' height if they are provided. Under the sink isn't a safe place to do that. I provide areas in my pantry shelving for various items and identify those for the guests.
I purposely don't leave lighters or matches as I don't want any candles lit in my home. (or smoking)
I'd like to have a way to have the 'I forgot this' items accessible if needed but not left out for guests to carry home if they don't need them. Does anyone have any suggestions for that?
If all bedrooms and bathrooms are on a second level, that should be noted in the property description.
Electronic Entry is absolutely the answer and the best. Meeting anyone for a key is not convenient.
Clearly defined, safe parking areas are important.