Jeanine --
The concierge cabin that we toured was one of the aft ones, and since the deck is larger than the ones along the side of the ship, it makes the cabin feel larger - if we were going to have a concierge cabin, I'd go for one on the aft!
As far as I know the water is fine, I drank it and didn't have any problems.
I'm sure you will enjoy your trip!
