I was here the first time ever during St Patricks and due to circumstances spent and entire day here!
However, it was during El Clasico (Real Madrid vs Barcelona for you non football fans) that this place erupted. There were so many die hard fans of each team and with, what seemed like, infinite amount of TV screens the echoes of "oohs" "aahs" and cheering was deafening!
Apparently they have an awesome terrace during the summer. Gotta check that out soon!