My sewing room is the sun room. It's all windows except for one wall. I do get very good light and a view of the golf course. We do have a guestroom I could use but then I would be all over that room. My sewing room is small but am able to have a convertible sofa, tv, dvd, small ironing board and of course my Janome and stash. It's cramped but it works for me.
I've thought of taking out the sofa making more room, but my son and SIL love sleeping in there in summer with the windows open. The girls get the guestroom. DH is able to see me or call to me at all times, except when he's doing laundry. Whatever it takes, right?