Directions

From Barcelona Airport:

Barcelona Airport: The best way is to take the 'Cercanias' train C10 towards Barcelona, the third stop is Sants Station. It runs from 06:00 until 23:44 every half hour. (20 min ride)
For this journey you can already buy a ticket called T-10 (ten journeys) at the vending machines, this is the best ticket for your travels in Barcelona.
There is also the Aerobus (blue) that goes from the Airport to Plaça Catalunya and Sants Station. This one takes a bit longer because it goes to the city center and back, and it´s more expensive.
Once at Sants Station, get out of the Station by Plaza Joan Peiró (by the taxis), turn right after crossing the traffic lights at Carrer Comtes de Belloch and then turn left on the the third street, it´s Melcior de Palau, we are at number 70-74. (5 min, allow two more if you carry a big bag!!)

From Girona Airport:

Take the Barcelona Bus outside the airport and stop at Barcelona Estació del Nord. (1 hrs)
There you´ll find metro L1 at Arc de Triumf, take it and stop at Plaça de Sants. (10 min)
Get out of the station by Carrer Alcolea, walk Alcolea until you cross the main road (Passeig San Antoni) and then keep walking until the third street on your left, its Melcior de Palau, at this block you' ll find number 70-74. (5 min)

By train:

Most trains will arrive to Barcelona Sants, but due to extension works some international trains have been diverted to Estación de Franca.
If you are not lucky and arrive there, don´t panic, there is a new train service from França Station to Sants Station, is the service that covers the line Barcelona- Airport (C10) stoping at Sants Station. It runs from 5:12 to l 22:42 every half hour.
(13 min)
You can also take the metro at Barceloneta L4 and change in Verdaguer for L5 that will take you straight to Sants Station. (30 min ride)

By bus:

International buses arrive to Sants Station and most national ones stop at both Sants and Nord stations, to know hos to get to the hostel from both stations, look above!!

If you are already in the city, there is another metro stop called Plaça del Centre L3, that is only 3 min walk from the hostel.