Small as in 3x3m or less.
Our room gets SO stuffy, hot, uncomfortable etc.
Previous house had tall ceilings and big rooms, so the airflow was good, but this house is a small, mid terrace one. I have to have a fan going, or an air purifier on most nights. It probably doesn't help that the window handle is broken
and we only get air in from the closet which has its own window for some reason.