Also have a dual purpose room. We did inexpensive white shelving units around two walls, with fabric boxes to stash stuff, (office, and my "crafty" supplies), threw in a few decorative items. Got a tall basket for rolled up mats/foam roller storage, a complementary lower basket to throw in the requisite elastic bands, small hand weights, etc. Decorated walls with pics from our travels, framed with colored mats.

Hmm looks vintage! That detail is beautiful. Could you email the old owner of the store?

I agree with all the comments about back rests and white stools getting dirty easily. My friend was devastated when her guest sat on her brand new white chair with jeans and the indigo dye from her jeans stained the chair forever. I’d also be wary that the white you choose for your stool blends with the white of your kitchen. From memory, your kitchen and bench tops are a warm white. The stark white of those stools could be jarring to the eye. Just saying....

Though I don't know for certain, I think the cotton/linen shades are removable. I wasn't able to determine this by my searches. This could easily be confirmed by making an enquiry to supplier before purchase. Alternatively, a handmade one could be made removable by making shade slightly larger than frame and making ties.