From first-hand experience, Japanese apartments can be very tiny and pack a lot in a small space. Something like ~20 m^2 / 250 ft^2 range. E.g. see photos here

From first-hand experience, Japanese apartments can be very tiny and pack a lot in a small space. Something like ~20 m^2 / 250 ft^2 range. E.g. see photos here: https://apartments.gaijinpot.com/en/rent/view/216237 https://apartments.gaijinpot.com/en/rent/view/216237 (about $1,100 USD/mo)