It's very personal preference. Mine have no arms, fully upholstered, swivel. I LOVE them. I would match the metal to the hardware on your cabinets. How long/who will be sitting there?

I don’t think those gold ones would work, no. Neither the color nor style relate to anything else in the rooms.

IMO none in front of a fridge

What can I do to improve the overall look of this kitchen?

I think your kitchen is very nice looking but agree that stools in front of a refrigerator and stove isn't the best idea. It’s so nice to see cabinets that aren't white! The thing that sticks out to me is that very red floor that doesn't play well with the rest of your kitchen.

I know! I want those red floors gone!

Keep the stools you already have. they are unobtrusive.