Mine is 20x30, and is packed with stuff. It was built for a watercolor artist, so has 7 windows and 3 skylights. I would prefer fewer windows so as to have more wall space. I like all the light but worry about fabric fading. I would recommend at least a half bath for you and hubby to share. I also like a place to heat water for beverages. Started with a dorm frig, but decided against it. At least partly smooth floor. Mine is on a slab, and it gets cold, so one half is carpeted. Messy tho', with lots of vacuuming to clean up both smooth and carpeted sides. Have fun dreaming and making it reality! Lucky you