As a guest I am just happy for a comfortable bed, extra blanket in case it's cold and a socket to plug my phone in, especially if it's just for an overnight stay.
If I'm staying longer than one night then I appreciate when hosts have made space for guests. I'm not expecting a fully empty bedroom with no personal items at all but minimal knick knacks and somewhere to put my stuff is my basic expectation.
There's nothing worse than wanting to put the things I need like my book, glasses, pill case, phone and bottle of water on the bedside table but there's no room because there's a little porcelain statue, decorative vase of fake flowers, scented candle, and random family photo as well as the bedside lamp there already. So then I have to move them to some other usually already full of other knick knacks surface and then put them back again when we leave looking at you ExMIL
Also I don't expect fully empty furniture but if I'm staying for more than a couple of days I think there should be at least one empty drawer/a shelf/some wardrobe space to unpack into and if they only offer drawer space then at least a hook on the door or some hangers to hang on the side of the wardrobe if needed. That way I don't have to live out of a suitcase for days on end and have random piles of dirty clothes on the floor as I have nowhere to put them, I prefer to unpack and then use my bag/case as a laundry bag so it's out of the way and I essentially "pack as I go", because every drawer/wardrobe/space is stuffed with the host's things.
It's nice if people add little touches like a few books/toiletries/spare charger etc but they aren't necessary - if I'm staying for one night I'll usually manage without the forgotten item for the night and if I'm staying longer then I can just ask my host in the morning to borrow whatever I've forgotten/go out and buy it myself (eg forgotten toothbrush that I don't notice till everyone else is in bed and I'm getting ready to go to sleep ... my teeth won't fall out if I don't brush them for one night, I'll just do it when I get home the following day and if I'm staying for a while then I'll ask my host in the morning if they have a spare and if not then I'll pop to a shop when we're out and about that day)