Good to know:
Some Hotels in Venice are ABSOLUTELY not reachable directly by the Water-Taxi, either because they do not have a private Water-Door, or nearby Pier, for the Taxi to dock, or because they are located in really small canals inside the island that are not navigable by the Water-Taxi; Other Hotels are located in areas called Secluded Waterways Zone where the Water-Taxi can navigate only with the right conditions of tide and weather. If, on the day of the transfer, there is bad weather, low / high tides, etc, and the Water Taxi cannot reach the Hotel, the drop-off will be at the nearest accessible dock and you will not pay the extra-fee.