Girona is a great place to stop by, as in transit for a lowcost flight, as just for visit when passing through.
It's catalan ambience is well noticed all over the narrow and historical streets, full of cafes and restaurants, handcraft and souvenirs little stores.
Besides the gorgeous scenery of the coloured houses through the Onyar river, Girona has several streets with ancient buildings and monuments (such as the Catedral and the Iglésia de Sant Feliu), the Banys Arabs (arabian baths) and the amazingly well restaured Muralla (ancient city walls).
Spain is always synonymous of Tapas (small portions of different kind of snacks), Paella (tipical saffron rice), Sangria (fruited and sweet red wine) and Cañas (small glass of local beer). So, Girona, as a traditional spanish and catalunya city is no exception.
Obviously it hasn't the magnitude of Barcelona, but is always a nice place to visit, specially the walking through the narrow streets of the jewish quartier.