I don't have a sewing room, exactly. The room where I stow all my fabric and supplies is also tripling as my husband's home office, and our home school room, at the moment. A little squishy. So I don't really do my work in there, just go get what I need and bring it where I'm working.
My sewing machine is an old singer that is attached to a table that it folds down into. I had it in our room for a while but running up and down the stairs got old. Now it's in the living room until I can find a better place. We now have a nice peninsula in the kitchen that I set my cutting mat up on, so I tend to go back and forth between the living room and the kitchen a lot when I'm piecing. The ironing board goes wherever it's most convenient when I'm piecing- either the kitchen or the living room.
My 9-year-old has her own sewing machine, I set her up with it and the ironing board in our dining area yesterday, that worked out nicely.
As for quilting, I quilt by hand so it's pretty portable- I take it wherever I feel like quilting- the living room, outside, in front of the tv when I want to watch a movie at night, in the car...