Kotatsu are great. And you can apply the same concept to a desk. I have a tiny infrared panel mounted on the underside of my desk. IIRC it's rated 150W. I can comfortably work when the room is 15°C while the panel is on roughly 60%. That's 0.5kWh for a working day. A lot better than having to heat the whole room.
I have a 3080 and 5800x under my desk. I turned off ECO mode and keep it slightly overclocked all winter. The more efficient my code, the colder I get.
Yeah, the eBay listing described the table as a desk. Our original intent was to use the table for crafts, laptops, etc etc. It's very quickly morphed into the central location of our little townhouse :)
I want to get some sort of reflective or insulating rug to alleviate some of the effects of the cold concrete floor. But until then, slippers do just fine!
