Thanks Ginny and Claudia. I did find a guide named Jordi that Ngaire recommended. His English seems to be good and he knows the city. I'm looking forward to doing the Gaudi tour. However, since we are in Barcelona only until 3pm I doubt there would be time to see Montserrat.
By the way, does anyone know about guides for Bordeaux, Lisbon or Cadiz? Thanks. Tom.