Royal Caribbean Ships with Solo Cabins: Radiance of the Seas (3), Serenade of the Seas (3), Brilliance of the Seas (3), Quantum of the Seas (28) and Anthem of the Seas (28). Cunard Line. Cunard is the latest cruise line to get in on the solo cabin trend. Nine solo cabins will make their debut on the December 16, 2014 sailing of the Queen Elizabeth. Eight of these staterooms are outside cabins with large windows and one is an inside cabin. These cabins are located mid-ship.