My couch is in my livingroom. Although seeing it mentioned if it's paired with a loveseat I will refer to it as a sofa in that case.

My grandma always called them Davenport. Used to be rather confusing for me as a child. But then again, according to her, we didn't wash our hands in the sink, we used the basin, we didn't turn on the water faucet it was a spigot, we didn't wear pants we wore slacks, and we didn't put on tennis shoes we wore sneakers.