We just returned from the Dec. 20-27 cruise on the Jewel: my wife and I (both 53), and our 20 year old college sophomore daughter and 18 year old high school senior son. These longish, idiosyncratic reviews helped us, so here goes.
Just to put us in perspective: fairly well travelled (couple of weeks in Europe every other year, a week in the Caymans most years, and a few weeks on Kiawah most summers). We have never cruised or done package tours; even out of the way Greece, Turkey, or Italy we plan ourselves, albeit at mostly higher end places. My wife is concerned that as the kids' schedules get more hectic, family trips will be harder. (I suspect the lure of free vacations will take care of that.) Anyway, we decided to try a cruise (and to not host Christmas for the first time in many years).
Worked with a great TA, researched on Cruise Critic, and decided on NCL Jewel as a good balance of ship, itinerary, etc. We live outside D.C., but it is an easy direct flight to Houston. We had an aft suite (I could never figure out if it was a penthouse or not, but it had the butler and concierge, so not sure it mattered). We had the kids share a balcony room next to us; they haven't shared rooms when we travel for many years, but we were--needlessly, in hindsight---concerned about security (not really concerned, but never having cruised....) that we put them together near us. They were good sports about it, and the steward made some tweaks to give them more privacy.
Nice, spacious cabin. Aft facing, so very quiet. Loved it.