We took this cruise with 5 other friends (all of us 35-40). Alaska itself is amazing, and I now understand why everyone has this on their bucket list. Go on this cruise for that reason alone.
However, if I compare this cruise to other RCCL I've taken in the Caribbean, New England, and more, it was meh. The theater entertainment was overall not appealing - the theater was never full. The main dining room didn't include very much Alaskan flavor - apparently it was in the rebranded specialty "cantina". The cruise redeemed itself with a great Cruise Director and staff, with entertaining onboard activities. The trivia was good and had a great variety. The multiple dance parties kept old and young happy, as well as the dance activities.
The ship itself has been updated, so it's the RCCL quality I have come to expect. The cabins were well-maintained, and the public areas were in good shape. For fun, go up to 12 and look down on the centrum. I loved the multiple lounge areas that were off of the centrum. Make sure to explore the whole ship.
Standard interior stateroom. Only issue is that it backs up to crew spaces, so you could hear crew movement and an alarmed door often.