We've been on several cruises and Norwegian really impressed us. First getting on the ship was fast and easy. We had a penthouse suite so that gave us VIP service (I totally recommend this)
Our cabin was really nice, the balcony was okay but not what I would call extended, it was longer than wider (for example, 2 loungers long and 1 1/2 lounger wide)and partially covered.
Our penthouse suite came with a butler and concierge service. Our butler Arie was great but we didn't use him or the concierge service much. Every afternoon Arie did bring us snacks such as finger foods, sandwiches and canapes, plus he kept us supplied with fruit. The room does has a great coffee maker, amenities are pretty much to normal shampoo, conditioner, shower gel, and they have a bottle of sparkling wine in your cabin for departure.
This is a great cabin if you don't mind lots of motion. The view is fantastic, the balcony is long but not very wide, the hallway is very quiet and the cabin is nice and roomy.