>>8137734> I believe the "couch" is there for any guests that ask nicelyOne bed is likely for the owners.
Couch is extendable. If they have 4 people visiting, they put it somewhere (like behind a shirm), and assemble another sleeping place for themselves. And there is no room to properly extend the couch in the guest rooms.
If someone asks nice and in advance, I believe they can get then a folding bed. It is NY after all, and you can get a lot of things in a big city with the right money and time.