Re: The TOS Recreation Room(s) Sets
I don't know if "crew lounge" actually is more accurate a term. I've never seen a script (or characters) call them that--only "Recreation Room."
Going by onscreen dialogue we do have the "Briefing Lounge" rec room in WNM (was the Briefing Lounge converted into a rec room but kept its original name?), a "Crewmen Lounge" Lokai and Bele passed between Deck 3 and Deck 5 in LB and a "Crew Lounge" where Kang and Klingon company waited for something to happen in DD.
"The first duty of every Starfleet officer is to the truth" Jean-Luc Picard
"We can't solve problems by using the same kind of thinking we used when we created them." Albert Einstein