first of all welcome to our cruise caht. Hope you will feel fine here an find all the informations you want to have.
I will try to hel you with your stateroom on the Oosterdam.
Your cabin #6158 is a Deluxe Veranda Sute at the stern (left side of the ship). To the stern : 33ft.
First you may click at "Upper Veranda Deck", than scroll down and click on cabin 6158 on the left.