I think it's less of the size, and more of other things like amenities, and imo, those tiny windows.
I have lived in (modern) rooms not much bigger. For someone living by themselves, it's not bad at all. And lots of people do live in such sized spaces - eg hotels, or cities like NYC.
I have no idea how expensive the rent there was, but if it was low enough, in a large city with enough people on a tight budget, lots would be interested. Heck, with the current housing shortage in many places (like NL) where even getting a place to stay is a challenge, there would definitely be takers for such a place.
I have lived in (modern) rooms not much bigger. For someone living by themselves, it's not bad at all. And lots of people do live in such sized spaces - eg hotels, or cities like NYC.
I have no idea how expensive the rent there was, but if it was low enough, in a large city with enough people on a tight budget, lots would be interested. Heck, with the current housing shortage in many places (like NL) where even getting a place to stay is a challenge, there would definitely be takers for such a place.