I am fortunate that my apartment as small as it is, had a nice size bathroom That is where I keep "Jazzy", my mobility chair. I move it to the other room or even in my hall outside my door when I take a shower. I have an open floor plan, though only 338 sq. ft. and it is built to easily accommodate a wheelchair.
I wanted to add here that I did not get a doctor's order for the rolling walker or the mobility chair. I bought them myself. My chair was used but looked like new. They both have given me my independence. Actually I was using a cane and that made my knees worse. The rolling walker for me has made it so I can walk more than I was before. Never had any problem with it.