Q's picture is not Marine One. The curtains in Q's photo are full size and taller than the lamp. Look closer.
It is not the same room. Look at the lamp, the curtains and the desk. The desk is full size. The curtains are full size and bigger than the lamp. There are non secured items on the desk that would not stay there during a landing and flight if that were Marine One.
I think we have a winner! POTUS' office on AF1. That fits. The lamps are the same, the white magazine rack behind the chair. The lamp and objects on the shelf.