To get to the island, you can embark on the company PENN AR BED which provides the crossing all year round between one and three times a day depending on the season. You can book your ticket directly on their website. Doggies are allowed on the boats. Arrival at Ile de Sein, no car, you can go directly to the house - map provided when booking - depending on the time of your arrival, someone can also wait for you at the dock.