I have a one bedroom apartment now and I share part of my it for my shop. I somehow managed to get two doors that I use for my work area to fit in and still have room to move around. It is very small space...yet it works for me.
The storage are for my cards, mailing supplies and extra paper, etc. are all in my closets. (Good thing I don't have a lot of clothes...LOL)
No store front, no sign, just a room with a workable area to get my cards made. The lighting is awful and my pictures have not been the best, so I am trying to figure out what to do about that and how to fix it. But, overall, I can't really complain. It's "my shop" and it suits me just fine.