In my former house, I had a studio in my basement (our current home has no basement or I would be down there now.) I put down a big, thick area rug and hung posters on the wall and from the ceiling joists. I had a television and stereo speakers and couldn't have been happier. The lack of natural light didn't bother me since I was working and sewed at night so there would not have been light anywhere. The biggest benefits were the almost limitless space and the lack of any need to straighten up the work space after a sewing session since no one else came near it.
Hope you enjoy your space half as much!