I also took over a bedroom for my sewing room for awhile but it was too cold in the winter so now I use the den. I have to tell you that when our youngest son moved out, I gave him his bedroom furniture and the living room furniture (he slept on the couch and loveseat more than his bed). He was 21 and just bought his first house. 2 years later he sold his house and moved back home (with his indoor dog). He let the dog sleep with him so I wouldn't let him sleep on my guest bed. They stayed in the den and used the hide away bed. Lasted about 3 months then he moved out. I didn't want him to get to comfortable....hehehe
Your space is so sunny and light. Love it.