I use 4 rooms.
My office is where I store my fabric, rulers, notions and WIPs. They are kept inside 4 large plastic containers.
My dining room - when I usually cut fabric, and baste.
My spare room - houses my sewing machine inside a sewing cabinet. The cabinet looks like furniture when folded up. Sometimes I move the cabinet into the lounge - depends on the project.
The lounge - where you'll find me hand quilting, and attaching the binding :)