Key word is "personal"
"Hell's Kitchen" and other slums of the time had entire families sharing a single room. There was NO "personal space". These "micro-apartments" will be limited to one or (at the most) two people, giving the occupants their own spaces.
BTW, when I read about these "micro-apartments",read people's commments about them, and see pictures of them, one thing always comes to mind: "Wow! That's a really big dorm room!"