While adequate, cabins are probably the weakest aspect of the Marco Polo in comparison with the increasingly more luxurious offerings of larger ships. There are 15 categories: Deluxe Suites, Junior Suites, Deluxe Oceanview, Premium Twin Oceanview, Superior Plus Twin Oceanview, Standard Single Oceanview, Superior Twin Oceanview, Standard Plus Twin Oceanview, Standard Twin Oceanview (two sizes), Standard Single Inner, Premium Twin Inner, Superior Twin Inner, Standard Plus Twin Inner, Standard Twin Inner. About 70 percent of the cabins are outside, with a mix of windows and portholes depending on location in the ship and some obstructed views. There are no private balconies.
Within most categories, you will find similar sizes and amenities in most cabins, but in a wide variety of shapes and layouts. One thing that is important to note is that there are very few cabins that have convertible beds; most cabins have two fixed single beds, bringing to mind the sleeping arrangements of 1950's American sitcoms. Very few cabins have fixed king or queen beds.
All cabins have hair dryers, electronic safes, individual thermostats, direct-dial phones, waffle-type bathrobes and televisions offering nine channels of programming: CNN International, BBC World, a channel featuring various classic British programming, three movie channels with a mix of recent and older films, a channel dedicated to the highlights of the Cruise DVD, a ship information channel (this features shore excursion lectures, the cruise director's morning show, etc.) and a "view from the bridge" channel.
Junior and Deluxe suites add marble bathrooms with tub/shower combination, refrigerators and sitting areas as well as walk-in closets. In the remainder of cabins, the bathrooms are fairly standard, small modular types with a small shower stall and shower curtain (not a solid door). The modular bathrooms have a real tile floor and quiet-flush non-vacuum toilets. (This plumbing system -- a nice change from the noisy, unreliable vacuum systems on newer ships -- is another legacy of the ship's pre-1970's origins.) The bathrooms do look slightly dated -- you may find a scuffed sink or a bit of stained grout in your cabin bathroom -- but this is typical on a ship more than three years old or so.
Most cabins are average-sized to small, though generally speaking Standard Plus Twin outsides and Premium Twin insides are larger than the rest. Most of the Standard Plus Twin and below outside cabins have portholes, while the higher grade outside cabins have windows that may vary in size from slightly larger than a porthole to almost floor-to-ceiling, and may or may not have obstructed views. (Among the higher-grade cabins and suites, only Deluxe Suites do not have obstructed views -- and there are only two of those.)
Color schemes include blue, green and red depending on deck (cabin passageway carpet is also color-keyed to the cabin decor), and cabins feature nice honey-colored wood furnishings and multiple mirrors (for example, all wardrobes have wood-framed mirrored doors). In non-suite cabins you may find storage space, particularly drawers, a bit limited for some of the ship's longer voyages -- but this does vary from cabin to cabin.