The Longships' two-room suites are indeed comparable to upscale accommodations you'd find on ocean-going ships, though it's important to note that they're smaller in size because riverboats have more space restrictions. The big difference between suites and cabins is simply that suites have a separate living room with a door that closes off the bedroom. In my cabin, number 304, the living room features an expansive seating area, mini-fridge, flat-screen TV programmed with complimentary movies and the usual satellite channels, and a small desk.
Whether in suites or standard verandah cabins, the bedroom is laid out pretty much the same, with the same color scheme. The biggest difference, oddly enough, is that the standard cabins have much more storage than suites.