There is the website Nullbarriere. It provides very good information about turning circles ([Zirkel ist dein Freund]), necessary widths, and sample floor plans. 80 cm is too narrow. It causes scraped knuckles and elbows. Variant 1 allows access to the bedroom, variant 2 does not work at all, variant 3 is tight (especially since the tip in the bathroom has no added value).