You will receive your exact check-in instructions two days before the start of your program. You are responsible for getting to your apartment from the airport.
If you arrive at the Barcelona airport, you have a few options:
Taxi: you can go to the taxi stands or call an Uber to take you directly to your apartment
Metro: You can take the Barcelona Metro line L9 Sud (South) from Barcelona El Prat airport (BCN) to the city center in about 30 minutes. The L9 Sud connects terminals T1 and T2 at the airport with the city, with trains running every 7 minutes. Look for the red and white Metro signs at the exit of both terminals. You can buy a ticket at a vending machine, which also sells BCN public transport cards. You can't use a standard single metro ticket to go to the airport; you need a special Metro airport ticket called Billete Aeropuerto.
Bus: The official shuttle bus from the airport is called AeroBus. It runs between the airport and key stops in the city. You can buy your tickets from machines at the airport. Take the bus all the way to Plaza Catalunya, then your apartment will be within a 15 minute walk, or you can take a short taxi ride from Plaza Catalunya.
If you arrive by train you can get a taxi at the train station.
Once you drop off your luggage at your apartment, you’ll likely never need a taxi again in Barcelona, everything is walkable and you will have access to the metro system.