Without first having read the comments on your website, I came up with similar words of praise to those of previous travelers--so it must be true! I heartily agree with the others that this is clearly more than just a job for you.
Here's my testimonial:
You will never find a better guide than this one!
Petr speaks English beautifully, is extremely knowledgeable, and is a genuinely kind-hearted person. His passion for history and humanity shines clearly through. Petr has lived through a significant and harrowing era in Prague's past, and is able to bring all chapters of Czech history to life with his vast knowledge of literature, landmarks, architecture, etc.
I was fortunate to go on multiple tours with Petr, some with 3-4 people and some with 20 people. Our little group signed on to extra days since we realized right away that this was someone special. Smooth logistics and Petr's calm nature made the larger tour groups feel as intimate as the smaller groups.
Thank you, Petr, for making our visit to Prague a profound and enriching experience!