The most direct way to get to Hotel Ai Cavalierli di Venezia from the airport is to take a private or shared water taxi. Unfortunately, this is also the most expensive method. The water taxies are smaller boats than the larger Vaporetto boats and they can navigate the narrow canals to get you right to your hotel. Taking the Vaporetto or Alilaguna service will involve a fair amount of walking. Even taking a water taxi from the airport will involve some walking as you have to get to the dock at the airport, which is about a 10 to 12-minute walk. Your hotel looks to be located right on a canal that a water taxi should be able to navigate so I suspect they would be able to drop you off right at your hotel.