Hi, my name is Amélie, I'm French and just come back from Barcelona. I've spent a year there and I know how hard it's to find an accommodation when you're not yet in the country. I was in this case the last year and I've found a really good agency which has found a room for me, its name is Barcelonaroom.com. The agency fees are a bit high but their services are perfect. I lived in a big flatshare with 2 English guys and a French girl. It has been a great year there. My room had the reference HM ADMIN 2 S. Don't hesitate to contact them at mail@barceloanroom.com, the team is really fun. Ask for Amy. Cheers
It´s been a couple years since your stay. For next time, check out www.apartmentbarcelona.com and look at all the locations that they offer! It´s probably cheaper for you too because they won´t have any fees.