Have in mind that you are not booking whole apartment. You are booking 2 rooms. 1 Bedroom with separate bathroom which also can be accessed from the main area, 1 small bedroom (study room) with high quality queen air mattress. 2 More queen mattresses can be used in main area if more than 4 people are staying.
I myself stay in apartment in separate bedroom. I will not be using your bathroom as I have additional bathroom connected to my room.