I don't have a "sewing room" (oh, I'm wishing I did most days, too). I sew at the kitchen table which is the same table we homeschool at and eat all our meals at.
One benefit - I'm forced to clean up my "mess" constantly.
One downfall - all that putting away and taking back out takes up a LOT of sewing time!
Ok, maybe two downfalls - it all lands on the counter separating the kitchen from the table...
I keep trying to talk hubby into giving my the garage :)