Location Transport

What is the best public transport option from Barcelona airport to Rocafort or Placa d'Espagna?

We want to get from the airport to our hotel preferably via public transport. We are not sure exactly how to do it. Which metro line goes to the airport? There is no information on the Madrid public transport page, or on the airport page on Metro going to the airport. I cannot figure out how to do this on metro. There are some kind of shuttle bus and a RENFE train. Which is a better choice?

Public Comments

1. Plaça de Espanya is a HUGE hub of all transportation. There's a big metro station there. Just take the Metro. It costs, like, a euro.