I am a member of the Association of Official Tourist Guides and counting with accredited professional experience. You can see the testimonial of other traveler in TripAdvisor

To develop the profession of Tourist Guide you need to be enabled by the Junta de Andalucia, The licence is achieved after passing the exams with at least two foreign languages, extensive knowledge in the artistic, cultural and history.

The most recent reviews refer to me you can see it in TRIPADVISOR