I took a chance to book a couple of paying tour with a company specialized in "free tours", and I'm happy I did. Margarita was my initial contact, and she helped me planned a perfect day in Santiago de Compostela. She was very responsive and patient, and answered my million questions. :) On the day of the tour, We had a private city tour for our group of 4 with Cristina, and we bonded with her immediately! She was very fun, caring and professional. She gave us a really good overview of the city, and told us the history of the city. Then we met up with Diego, who gave us a guided tour of the museum and the cathedral. Also a great guide. I highly recommend this tour company!