chicagocruising

I'm sailing on Adventure on 12/29. We chose to let them assign us a stateroom, but it is a balcony. When do we actually find out the specific room they've assigned? Is it not till we board? Also, the eDocs they sent still says "GTY" for stateroom number, but the deck says 6. Does that mean we will be on Deck 6 for sure, or is that just a placeholder because the computer made them put something?