We received a confirmation email for a tour starting at 5 pm from Fuente Plaza de la Virgen in Valencia. When 5 pm arrived and no guide apparently there, I called the guide and she told me that she was leading a tour that had started at 4.30 but gave me instructions on how to find her. This we did, and so had 3/4 of the tour with her. She was informative and enthusiastic and excellent.