I do believe it is an era before mine perhaps even pre war. Conditions on P&O's Iberia for Assistant Steward in an 8 berth cabin were a bit better, each 2 tier bunk placed end to end had about 2 ft seperation between them, area below bottom bunks was fitted with drawers, we did have chairs with backs though not reclining and each bunk had a draw curtain, wooden lockers of a decent width were also provided, the void between would have been similar to that in the photo. My promotion to Pool Attendant rated a 6 berth (I Think) or 4.
Guys from another place on lower decks were 16 (or more unsighted by me)
Previous to that I had been on RFA Wave Class (built 44) as a Boy Rating in a luxury cabin built for two, during that time I had visited Tide Class and I am sure they were 6 to a cabin.
I was EDH on the Empress of France.2 trips 11/3/58. 6 berth cabin,just like the one pictured. There was 3 more bunks,but never used. To one side of the cabin,we had the Port Spurling Pipe coming thru.I'd hate to be Watch-below if they dropped the Hook.