You have a few options for getting to Ca Dell’Arte from the airport. You can take the Alilaguna water bus; Orange Line from the airport, and get off at the Sant’Angelo station. Should be about a five-minute walk from there. Another option is to take a taxi or the AVTO bus or the ACTV bus (no.5) to Piazzale Roma and then take the Vaporetto (no.2) and get off at the San Samuele stop. From here you are just a minute or two from Ca Dell’Arte. The last option is a private water taxi, which will take you from the airport to as close to Ca Dell’Arte as possible. This will be the most expensive option, by far.
For your luggage, I would ask the folks at Ca Dell’Arte if it would be okay to store your luggage there as you are arriving early. Most accommodations are pretty flexible and will gladly do this for you.