On many ships, basic inside and outside cabins are usually the same size, the difference being that one has a porthole or picture window to let in natural light. Balcony cabins can also be the same size as standard insides and outsides, with the addition of the outdoor space on the verandah; sometimes the interior space is larger. A basic cabin, regardless of category, is referred to as a "standard" unless there is something about it that makes it different (such as physical layout, being handicapped accessible or a designated family cabin). With minisuites on up, you get bigger and bigger indoor and outdoor spaces.
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.
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".
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carnival cruise room layout