We were in 8516 on our only two Disney cruises so far. It really spoils you.
The first time we were in that room, it was a last minute upgrade, so I had no idea how to make arrangements with concierge. We had been booked in a Cat 3 suite, but I never got any letters or phone calls ahead of time.
The second time, we checked in at the separate line, and I made a point of asking them at check-in when and where was the meeting the first day with concierge. It was at 1:00 in the Cadillac Lounge (Sessions on the Magic).
We made spa and hair appointments, Palo reservations, kids' club reservations and we could have done shore excursions, but we had done these in advance. If I hadn't been able to get the shore excursions I had wanted ahead of time (for example, not getting to go on an excursion at the time I wanted) I would have been able to have concierge get me the time & excursion that I wanted, as they hold some back for this purpose.
When we had the room the first time, my DD slept on the bed in the 2nd bedroom as it was already made up as a queen. (I didn't know that they could make it into two twins....hadn't been on these boards yet!) And my DS slept in the "bunk" bed that came down from the ceiling in that room. They had plenty of space, and since there are 3 TV's in the stateroom, there were no arguments over what to watch on TV. There are some games in one of the closets in the living room also.
On the second cruise, I asked in advance (just through the regular
DCL reservation line) to have the beds made as two twins. DS would have preferred the bunk bed again, but I found it easier to not have it down.
Sometimes concierge experiences can differ. We never had to ask for more sodas or water on the first cruise. It was "magically" replenished. And the team was checking on us at least once a day.
On the second cruise I never (and I do mean never) saw the concierege team, except when we went to the receptions they held. I couldn't have told you their names, nor would I have recognized them if I had seen them on the ship.
After we had drank the original sodas & water that were in the room the first day, I called concierge and asked for more, and I was told that I would have to pay for them! I said "No thanks" and went to Preludes (by the Walt Disney Theater) and bought our own. If you bought two, or three (or whatever it was) you got the next one free....and they were ice cold, so they stayed cold in the cooler (refriderator) in the room!
We really didn't mind not having the concierge check in on us.....the soda thing bugged us...but having that room more than made up for it.
It is an amazing room....and it definitely does spoil you!
You will have an awesome time. Just don't be afraid to call ahead and ask for what you want...you are paying plenty for it.