In order to set the pricing many cruise lines will divide each cabin type into sub categories. For example a balcony cabin may be divided into sub categories such as B1, B2, B3, B4. In most cases the cabin size and features in a sub category is the exactly the same. The only difference is usually the location of the cabin on the ship. Please look for the notes on the category descriptions to determine if there is a difference in size or features between the subcategories.
Costa started the spa cabin trend, but many mainstream lines quickly followed suit. The concept is simple: Spa aficionados pay more for cabins decked out in Asian-inspired Zen decor that come with extra amenities, ranging from fancy showerheads and specialty bath products to fluffy bathrobes, yoga mats and healthier room service menus. Spa cabin residents are granted free access to spa restaurants (such as Celebrity s Blu or Costa s Ristorante Samsara), complimentary passes to spa pools and sauna/steam room areas, and may get free, discounted or priority spa treatments and fitness classes. And you do not always have to book a huge suite; on Holland America, several inside cabins have been designated as spa cabins with all the associated perks.
Exception: Carnival has several cabins which are classified as inside cabins but actually have a french glass door which allows light into the room (no balcony, but the door can be opened). Carnival also has some cabins that have a window, but because the window has an obstructed view (that means there is a railing or object in the way) it is listed as an inside cabin. Royal Caribbean has some cabins that have a window but look out over an inside promenade area. These are called "promenade staterooms".
Suite:A suite is a premium cabin on a cruise ship. It is usually much larger than a balcony and includes more perks. Suites typically have a full bath tub, large shower, larger closets, larger balcony, larger TV, and butler services. Expect to pay $400 to over $1,000 a night for a suite.