My sewing room is also a guest room with a full sized bed. It's 12 x 14, but I do have a closet (fabric stash). I have a nice lighted bookcase that is used for fabric, notions, etc. I used a small 'desk' as my sewing table and I use a card table as my work table. I also have a 2nd card table that I butt up against the other when the project gets big. I store the extra card table under the guest bed. My room feels great- not overwhelming and my cats love to keep me company, so it's comfy feeling. I don't have clutter, but I do have organized bins on my shelving- that cuts down on clutter.
Card tables, or other folding tables are great for when you have a large project. Not every project requires several tables, so you can store them away then. It'll help keep the clutter down, and free up the energy in your room.
Regards,
MaryAnna