Lol. 100 sqft is the legal limit under which you cannot rent a place in France.
It is the size of the worst rooms in student dormitory. Those have "extra" space that are shared for shower, toilet and kitchen. They barely exist today.
Not even the cheapest hotel rent that. No sound people wish that.
I've lived in very small sized appartement and would estimated that ideal to be around 430 sqft (40 m²). Even with a poor laid out place a single person doesn't need more that 590 sqft (55 m²).