living room/kitchen of a two-bedroom apartment with a communal bathroom and a window looking out on other tenants' laundry puts us firmly into the 50s period.
Here are pictures of the original design.
I am still confused. Where is the door out of the part of the apartment that the Younger's live? And is my diagram correct so far?(Travis' bed in the middle, the bedroom doors on each side of the stage,and the window to the left of the door on stage left?)