Grew up saying chesterfield, but now use couch. I think chesterfield was more common usage in the 60's, and perhaps in central Canada. Everyone I know uses couch.
I grew up sitting on a settee in the lounge. Now I lounge on a sofa in the sitting room. My Aussie daughter lounges on a ‘lounge’ in the lounge-room. Each to her/his own
Well, in Australia they call it a lounge. Which is very confusing. When visiting a friend she said "come and look at our new lounge". I expected a new extension to the house but it was a settee.