I agree with everyone else, it is a beautiful ship. The staff is great, the shows very good, the food could use some improvement, but mostly it was a terrific time. There were four of us ladies who travelled together and planned our tours (private tour companies). I highly recommend "Best of Ephesus" for both Istanbul and Ephesus. If you are doing the Amalfi coast try Aldo Limos - he is fantastic.
My biggest disappointment was the 3rd floor area where they have the dancing and sometimes the cast doing some performances. There is no place for even 100 people to sit much less 3,000. Everyone crowds around the floor with a drink in hand some on floor 4 leaning over the railing to see - it is a disaster!! Why they gave up the clubs that the Millennium Class ships have is beyond my understanding. The Solstice Class ships only accommodate more people but they do not give you more for your money. I will stick with the older ships of Celebrity, they are much more fun (and I am a senior citizen)!!
Cabin was in a terrific location, but the upcharge for concierge is not worth the difference, unless you are into hors' d oeuvres that are unappetizing. You can order shrimp cocktail and fruit plates yourself instead of little canapés that you have no idea what is in them.