You can do a lot with 400 sq ft and live by yourself. I think communal spaces like shared backyards or shared communal spaces (community space) is useful.<p>Look at this 375 sq ft studio.
<a href="https://www.youtube.com/watch?v=P9e4VFv4Wx8" rel="nofollow">https://www.youtube.com/watch?v=P9e4VFv4Wx8</a><p>Wouldn't you rather live in a private space than share?