He's an architect in his 20s, living — roommate free! — in New York City. Based on the street scene, he's right about here. He seems reasonably satisfied with it, as he describes minimalist impulses going back to childhood. There's room for a bed/sofa and a desk. My only outburst, watching that video, was "does he have WiFi?"
Picture a prison cell that size. Would it be too cruel? But inject the freedom to walk out the door at any time and have all of NYC. It's not cruel at all. When you're sleeping in your bed, the space around you doesn't really matter, and when you're sitting at that desk, it's not too different from a carrel in the library.