Ok, what is really needed is a bed. clean sheets. pillow. door.
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Next,
I really disliked staying in my SIL's house. The guest bed did not allow two people to put their feet down on each side (bed against a wall). AND, the under bed, every drawer and entire closet were jammed to the gills with the home owners stuff. So, no room for the suitcase, except on the bed with us, or closed and standing upright.
Have space in the dresser and closet for a minimum of guest things, space for suitcase / bag... next...
Mirror in the room.
Bedside table and lamp (just one side is ok, but two is bonus).
I like a clock radio, but with phones these days, not required.
Window coverings.
Bathroom -- Towel,
I also keep a packaged new toothbrush, a bathrobe (as I don't want to see the guests in their roo's.) and have shampoo / soap etc that they can access in the bathroom.
Hook on the back of the door is nice for purse, coat or anything, really.
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Luxury -- rug on floor if cold floors in morning, your charger idea is great.
Washcloth
Multiple pillows