We did ultimately see a "Captain's Ready Room" on the 1701. Kirk, Spock and McCoy went there to have an exposition-fest during TMP. It happens to be at the aft of Deck 2.
No, that's not a "ready room". That's the officer's lounge, and it's on the refit, not the original TOS ship [http://en.memory-alpha.org/wiki/Cons...cers.27_lounge