Unless sitting on a (potentially quite chilly) balcony in northern Norway is a must, you'll find that the IV staterooms are quite good for viewing all the wonderful views of the fjords, etc., while also being in a warm stateroom.
Also, the Edge class ships, of which Apex is the 2nd one built, have a refreshingly unique calming ambiance and decor. Eden restaurant for dinner is an especially good, upscale meal.