The Riverboat was located below street level. As customers descended a flight of stairs, the smell of European coffee and marijuana filled the air. The previous boathouse foundation was evident in the venue's nautical theme which consisted of red booths lined against pine walls and brass portholes. Gordon Lightfoot described the ambiance as "dark and wonderful" and stated that "it really did give you the idea that you were on some sort of boat". In an interview with Noisey, Jane Harbury - who was a waitress at the Riverboat known as "Riverboat Jane" - explained that even the venue's imperfections led to a nautical environment. It was fairly narrow inside and the "stage only played to the west side of the room. It was just like a submarine". American folk singer, Ramblin' Jack Elliot would sport a German accent on stage and declare "velcome to the U-Boat".