We took two of the Runner Bean Free Walking Tours in Barcelona. Day One we took the Barri Gotic/Old City tour with Tatiana ("Tati") who was absolutely wonderful. Her English was excellent and her knowledge outstanding. She gave us just the right amount of history and threw in funny stories about some of the local customs ( "the shitters" was a big hit). I would highly recommend this company.
Day Two we took the Gaudi tour with Miguel. Another very energetic tour guide who offered great explanations of the career of Antoni Gaudi and the amazing buildings to his credit. Miguel's tour also included 2 Metro rides that were a great experience. He also offered his help with suggestions after the tour ended -- restaurant suggetions, travel directions, etc. Another fantastic guide.
I would highly recommend both Tati and Miguel and Runner Bean tours for a fabulous experience in Barcelona.More