Martin is a seasoned guide who is doing his best to make everyone comfortable. He is knowledgeable about Prague and open to any question.
The tour was interesting and gave me a good first impression about Mala Strana and the Castle. The restaurant was fine, one could see it is a genuine place and not gentrified, which was cool although the food itself wasn't outstanding. The concert was average, which is nothing Martin is responsible of. The musicians did not execute at their best level and made mistakes, it is probably a way for them to make money but their heart wasn't fully there. The programme, mostly composed of pieces that everyone knows, was a bit bland.
In conclusion, I am happy I took the tour thanks to Martin's relationship skills and the fact it was a very small group of interesting people.