About the "big easy chairs", there are a few places where they are at -- at least two. If you go by the British Airways lounge and then walk down toward the "corridor" that seems to go away from the main lounge area into a rather boring area, that's where you can find a bunch of such lounge chaisses. It's on the way between the British Airways lounge and the Mercure Hotel area where the pay-showers are located.

(I don't know where the free showers are at AMS.)