Worth a visit
Gepetto is definitely a good place to eat pizza in Gijon. I've been coming to this restaurant for years, and although the quality has lowered at times, it's generally remained more or less the same. The locals are very nice, and the service is great, although recently they've introduced a rather stupid reservation policy in the restaurant on Calle San Bernardo (at least that's the branch where we experienced it). But nevertheless, it's a restaurant worth eating at.