I had Wolfgang as my tour guide for the 10am tour (they also have one in the afternoon) and he was very informative. The tour didnt go super far, so there wasnt much actual walking involved, all the stops were quite long and none were very far from each other (some cities this is more the case than others, app depends on geography).
He gave us a 20 minute break during our tour because it was absolutely freezing out, and it seemed like sometimes they give the break sometimes not, depending how the tour is going.
The tour company was very easy to find as the instructions on Trip Advisor regarding meeting place were very clear, and a woman organizing had an umbrella with the information printed on it.
The tour mostly focused on history with a some architecture sprinkled in. Wolfgang also threw in some dad jokes periodically read more