You can get 4 keys with a terrace studio. This way you get a balcony which is the only reason you really want to stay at the cosmo. You can't get a balcony anywhere else!!!

If you have Marriott platinum status, I've gotten upgraded to a 2 room suite, but only one king bed. I was on business so I loved it. However, I stayed in a regular terrace studio and slept on the couch, no problem. Don't frett too much because the couches are comfy.