We stayed in the Pensione Accademia last year. We took a water taxi directly to their dock. It is right in front of the hotel through their own private gate. Not sure what they are talking about with the 5 minute thing. Perhaps they mean by Vaporetto. That stop is over by the Accademia bridge and it is about 5 minutes away. But they do have their own dock on a small canal off of the Grand Canal for private taxis.

Best, Nancy in Virginia