To add to PP's post, here's a crude visual of the 4th floor.
Most CL rooms are "behind the Innkeeper's Door" but rooms designated as CL also extend out roughly half way down the hall between the elevators and Innkeeper's door. One BWI CL stay I was in the room in red on that hallway and the CL rooms stopped a couple to the left.
You read some who say they like to be "behind the Innkeeper's Door" and will make that their request, in addition to any view request.
Hope that helps!
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