Goodness gracious - 8 sq meters, usable, with a window and separate bathroom- indeed, the bare minimum. No wonder so many people, myself included, rent these storage lockers like Boxful. I pay around $500 for a large Boxful locker filled with files and books, as well as some clothes.
For a single person, $189sq ft usable is doable, but I need to be creative, especially with so many books and files. Studios, from my experience, are fine, i.e. the living room, bedroom and kitchen are not separated, insofar as the fixtures and fittings are good.