Hey, what about a quick guide on how to reach the place from Barcelona City and from the Airport?
The Rodalies train system takes you to Castelldefels directly from either the city center (Passeig de Gracia or Barcelona Sants) or El Prat de Llobregat (not directly from the airport). You can find the schedule and stops of this train system here: Rodalies Barcelona. If you want to go directly from the airport, it seems that there is a bus that goes directly to the same stop that the train does, L99, from Terminal 1 (a free shuttle bus ride from Terminal 2): Google Maps . Hope that helps!
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