My husband and I recently cruised on the Sky with our two children and 6 grandchildren, ages 3-17. As always, Norwegian's cruise was wonderful. Excellent food, restaurants never crowded, lot of things to do. Our cabin steward took great care to make sure all three rooms were always spotless. The room is a little dated, but we were surprised after noticing our bathroom mirror was dark on one corner, that the next morning, it was replaced. We hadn't even mentioned it to the steward.
We unfortunately didn't get to go to the private island, as the seas were very rough, but we had a great day at sea instead. Several of our group were a little seasick, but he customer service desk had draminine on hand.
We will always recommend Norwegian as our cruise line of choice. In fact, we have another cruise planned at Christmas with the same big family group!