Much has been said and written about Allure. A few observations from a RCI Diamond Plus member.
Let me get the negatives out of the way first. The decor of the cabins is incredibly bad and old fashioned. How on earth can you build a new state of the art vessel with such old-fashioned and downright ugly standard cabins? What did the think? If you have a cabin with bed by the cabinet/wardrobe, then your cabin looks also very small. It´s much better if your bed is by the window. The bed is very comfy though.
The Sauna and Spa. Again, what did they think? In times, where all new cruise ships feature bigger and better spas and saunas, Oasis class has a little hidden something inside the ship, which does not earn the word Spa. Offered at a price where most people say "No" without regrets. The price is ridiculous and the space used is a joke. That was my biggest disappointment on the ship! No free sauna? What is it with that? Cheap.
bed by the cabinet which makes room look smaller and different to put clothes in and out cabinet.