two-mat area, approx. thirty-six sq ft

この部屋は二十坪ぐらいの広さだ。

This room is about twenty tsubo in size.

坪単価で計算すると安い物件だ。

When calculated by price per tsubo, it's an inexpensive property.

狭い坪庭が家の中心にある。

A small enclosed courtyard is in the center of the house.