I have the same situation as you...guest room with a bed, limited space, and oh yes it's my sewing room as well! At least I have a closet-that's now stuffed with my stash.
I use 2 card tables, I also have one of those white speckled plastic top tables- it's a little big so I don't use that as much as the card tables. I did have to buy mdf board at Home Depot and use that on top for a more straight and sturdy top for cutting. You can put them away under the bed. So it's a workable solution.
Regards,
MaryAnna