I have a 2m x 2m area in the basement I use. I wish I had a little more space but it works well most of the time. The low ceiling is the problem - your brain is so convinced that there is sky or a high ceiling above you that you try to throw something over your head and smash the controller into the ceiling. I have marks on the walls and drywall dust embedded in my controllers. The chaperone boundaries can't do anything to warn you about that and those mistakes happen too quickly anyway.

Yeah, it is. I am hesitant to buy a couch for this reason. I live in a studio by myself and basically my entire living room is a VR space and it is still pretty small.