Just how small does an apartment have to be before it's qualified as a 'microstudio?' In the case of Felice Cohen's Upper West Side apartment, that figure would be 90 square feet. She pays $700 a month in rent. Comparatively, the average rent for an Upper West Side pad is $3,600. Watch the video below to see how Felice lives in such a tiny place, and then answer this question: Could you live in 90 square feet?