From what I can make out, when it comes to areas of interest ...
Deck 16 below the suites area has the Teens Lounge on port side & video arcade on the starboard side; PADI at the forward corner; El Loco at the starboard aft corner; large galley at the aft center.
Deck 17 has a Gold Studio(?) along the aft end; and suites.
Deck 18 has the Suite Sun Deck along the aft end; and suites.
I suppose I can say that deck '19' has the second level of the deck 18 loft suites – 5 on each side up at the forward end, if I am interpreting correctly.
No info on deck 15 below this area. We know that part of it is the forward end of Windjammer.