Dosodura has water on two sides; we need a specific description in order to say which line serves it. Whoever let you the apartment should be able to answer exactly where it is and how to reach it.
In Venice postal addresses don't generally include a street name, very hard on visitors. They give the sestiere and a building number. With whese go to VeniceXplorer.com, enter them in the box on the map page and it produces a rather good street map with a nice fat dot at the location. Magic. However you may not be able to print it, so copy the dot to your own map and locate the nearest vaporetto (water bus) stop. With that go to the Actv page on the web and find which line to use from their map. Actv runs both land and water busses and has a website.
Getting around inexpensively (relatively) is possible by using advance purchase transport tickets from Hellovevezia or VeniceConnected before leaving the US. Go to both on the 'net and see what they offer and how they do it. These are most easily found by using Google. You don't have to type any more than the names, after that just point and click. You have to select the date of first use seven days or more in advance. They call it "withdrawal", not "pick-up". Better read the instructions carefully. I used VeniceConncted and picked up the ticket at Hellovenezia in the airport. She said keep the receipt in case you are ever challenged. The tickets are good on vaporettos (water busses) and the bus on land from the airport to Piazza Roma, where you can get the vaporetto to S. Marco. When you pick it up, ask if it has been validated (date and time stamped for the start of usage). You do it in the bus and on the dock before boarding a vaporetto. There are big fines for not doing it.
Getting to the airport can be done cheaply by Vaporetto to Piazza Roma,catch the #5 bus to the airport. Your transport ticket works on both land and water.
Been there, done it. ===gm===
