We made this the last stop on our holiday to give our boys -- five and ten -- something special to look forward to, and boy did the yellow submarine deliver! They were endlessly entertained exploring the space and various gadgets, trying on nautical and steampunk hats, and narrating their own incomprehensible (to others) adventure. There were no requests for screens all afternoon/evening (although in the morning they found the DVD player and watched the Beatles' 'Yellow Submarine' movie while we slept in). With three distinct areas (bunkroom, lounge, and wheel house up top), there were cosy nooks for the adults to keep out of way and read their books while the kids entertained themselves.
The crew's quarters did become a little chilly overnight, but once we grabbed the extra blankets on-hand we were nice and cosy. The bathroom (in the nose of the submarine) was challenging for my six-foot-plus husband, but fine for everyone else.