I would like to hear about the small group tours/guides that folks have used in Prague. -thanks
I can enthusiastically recommend Guenther at Kultur Cafe Prag:
He is an expert regarding Prague's history and tailored my tour to my specific interests. I had injured my knee and he graciously provided a strong arm for me to lean on so that I could see many sites I would have missed otherwise. The tour was definitely a high point of my trip.
My friends and I had a great tour (below) with Jason of Living Prague. Quite a few people here have taken one of his tours and been very happy.
https://www.livingpraguetours.com/tour/prague-old-town-jewish-quarter-walking-tour/
Another vote for Jason. In addition, his website is invaluable for planning your visit to Prague.