My studio is in our basement, too. We have a daylight basement, which means it's about half underground (in the front) and opens to the back yard. It is in the mostly-unfinished portion of the basement, with the wreckroom (family room) taking up 2/3 of the lower level. There is one small window at the ceiling over my cutting table and a regular sized window at the other end of the room in the laundry area. When I'm working in there I'm usually so engrossed in what I'm doing I don't notice windows (or lack thereof). We do have good lighting from one end to the other.
I'd love to paint the concrete floor someday, but it's OK for now. I do plan to hang some fabric "walls" in front of the under-stair storage, which will both lighten that area and, since I will sew pockets on it, I'll have some storage for extra notions.
Sometimes I get envious of those who have beautiful big windows and walls in their studios, but then I remind myself that I am very blessed to have the space I do have. Many have to scrounge a corner of a room or put their machines on kitchen or dining room tables and haul stuff around every time they want to sew. I'm somewhere in the middle and am happy, happy, happy.