I have this corner in my basement

https://midwest.social/post/34515442

First thing I'd think to do in such a corner is also a thin and tall cabinet/chest/other storage unit. Unsure if brooms would be good there as they may carry dirt/dust around and seem to be close to a few storage places as well as the sink itself.
Dishwasher?
my partner doesn’t like dishwashers, he says they engender weakness XD
Looks like a place for fermentation vessel.
250L Vertical Sterilizer Autoclave

does it have integrated vacuum/steam generator? Where would the exhaust go?
Into the room of course! Will give the place a nice sauna vibe.
Actually it’s too wide, it won’t fit :(
Looks like a 3D Printer could fit there.
not a good idea in kitchen, gases and aerosols will harm things both ways.

another suitably sized thing I wanted to build for some time is hot drinking water thermostat with zones for diffirent temperatures, like self-refilling gradient samovar column. To have fast and easy access to decent amounts of water of various temperatures in kitchen. Then you can instantly make perfect tea!

I wish I had more time for this project.

I would just extend the tabletop for extra work-space or to put the hot water kettle, and use the space underneath for storing pickled veggies.

Having examined the picture for several minutes, I can indeed confirm that it is a corner.

I’m not sure what size it is, as you’re using mediæval units, but I think a cat tree would probably fit in there. If you don’t have a cat, just put the tree, and leave the door open.

In my initial post I mentioned it is 20 in wide, with a 60 in clearance. I mean I guess inches are medieval, but I can’t tell if you’re being obtuse, European, or an asshole. Not that I can discern a difference between the latter two.

Cat tree is not a bad idea, except I live down here with my partner and he’s allergic.

Well, since you’re being so nice about it, my advice is to kick your partner out and get the cat you always secretly wanted.
Perfect for Grundor
Storage. Its awkward for almost anything else. Not sure what the rest of the room looks like but build a cabinet or shelving unit to place larger and/or infrequently used items.