I love chairs like the ones below, you can buy items such as them old or new. You could maybe add seat cushions or mix textiles with the metal to make it more comfortable feeling.
Don't forget to mix your design up with some natural elements such as wood everything more earthy and comfy. I love this sort of design and it could be in small spaces as many industrial objects are made for storage. Storage is of course essential in any small space to stop a room from looking cluttered.
Thank you for reading.