this. it took me ages the first time because the path thru the duty free winds to and fro and basically as you near the final leg of the store and see the exit, the entry to the lounge is directly behind you if you are facing the exit. in the middle of the shop. the red and yellow colors of iberia also blend in very well with all the duty free crap too.

the signage just blends in with all the duty free cigs and liquor and perfumes. so be sure to look up and around for the signage.