I use a really cheap stool (pictured in the lower left corner). It was about $15 on clearance at some home goods store. The thing I've struggled with a little

I use a really cheap stool (pictured in the lower left corner). It was about $15 on clearance at some home goods store. The thing I've struggled with a little is reminding myself not to slouch when using the stool. It may be worth buying one with a back, if you have the budget for it. Also of note is the fact that this desk is only really comfortable for me since it's fixed and non-adjustable. That's not a big deal in this case since this is my office, though. I'm a shade over 5'4", so my desk wouldn't be much fun for anyone a few inches taller/shorter.