Personally I'd choose the train... it's much more convenient and faster than the bus. There are trains every hour -give or take- and in the morning and late afternoon more often. The journey takes 90'. Stop at Barcelona-Passeig de Gràcia, the stop before the end of the line, and you're at a stone's throw away from the centre.
Check RENFE website (train company) at www.renfe.es
Thank you Enric, just rhe information we required.
Thanks for the replies, we're statying at CYE holiday centre.
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