As of April 1st, 2014, the vaporettos (waterbuses) of Venice runs after new schedule.
Where there used to be a 20 minutes frequency from before 7am until around 9pm, there is now a vaporetto every 30 minutes. Our page with instructions on how to get to our place has been updated with the new times.
The routes taken by the lines 4.1 and 4.2 which services the Certosa island, are the same as before.