DH and I were in Cabin 6538 on the 4-day Wonder last September (just 2 doors down from your cabin). We loved the location! It was just the two of us (no kids), and we enjoyed being Forward on the ship. The Forward elevator took us right up to the adults-only pool.
We also enjoyed being on the Starboard side. The Starboard side faced the port, and it was fun to watch the people along the coastline as we pulled out of port. Everyone was waving! Also, the Starboard side was adjacent to the dock in both Nassau and Freeport, so we were able to watch people getting on and off the ship (and interact with the characters). The Port side was adjacent to the dock at
Castaway Cay, but the Starboard side faced the family beach, and it was great to wake up, pull back the curtains and see all those colorful umbrellas!
The cabin itself was great. We loved the verandah! It really opened up the room (I was afraid that DH would feel claustrophobic).
It has a Plexiglas Veranda, it's midship, and the room doesn't have a connecting door to another room.
"Albiats" brings up a good point. Our cabin (6538) had a connecting door to 6536, and I wish it didn't. We had noisy neighbors, and the connecting door didn't help. I would imagine a solid wall might be a better sound-barrier.
I can't comment on the price you were quoted, as we are DVC members and cruised on points.