I would like to hire a car in Barcelona in August, to drive down the
coast (to Benicassim) to drop back again a week later before flying
out from Barcelona airport on the same day.  Based on the fact I will
be staying near Las Ramblas, I would like to pick up the car somewhere
relatively convenient to there.  And preferably also relatively
convenient to the airport as I will be dropping the car off before
flying out.  Based on the following, which car hire location would be
the best to hire the car from:

Cal Alalo
Cornella de Llobregat
Granollers
Mataro
Sabadell
Saints Train Station
Gran Via De Les Cort
Martorell
Railway Station
Sitges
Terrassa

I'm thinking it might be best to avoid Saints Train station area as it
will be swamped with thousands of benicassim festival bound people on
the same day.

Thank you.