Buses to Trafalgar: Buses Lines: 19 - 39 - 40 - 42 - 55 - N4 - H16. . You can check the routes and schedules in this webpage www.tmb.cat
From the airport
From the airport you can take a taxi or the bus. You can also take the Aerobús which leaves very often from the airtport to Plaça Cataluña, the last stop (city center) and walking distance to the hostel. If you want to take the metro, the closest stop is Urquinaona. This station is ten minutes walk from the hostel. If you prefer to take the bus you can take lines 41,39 or 55 to Trafalgar Street. Further information in www.aerobus.com
From the train station
The nearest station to the hostel is Arc de Triomphe which is located about 3 minutes walking. There you can take a taxi or shuttle bus from Barcelona.