Question Best Small Group Tours/Guides in Prague?

I'm planning a trip to Prague and really want to make the most out of my visit by joining a small group tour or hiring a guide. I've heard that the city has a lot to offer beyond the main tourist spots, and I believe a good guide can really enhance the experience. Does anyone have recommendations for small group tours or personal guides they've used in Prague? I'm especially interested in tours that offer unique insights or access to hidden gems. Thanks in advance for your suggestions!