Jumping right in -- our walking tour leader Caroline had precisely the attributes for an excellent experience -- knowledge, enthusiasm, and a firm and robust voice that held our attention throughout.
The structure of this tour is outstanding -- deliberately intended for small groups, which maximizes attention and communication -- and attention to the remarkable diversity of Philadelphia's Old City -- including but not limited to the range of highlights that center on Independence Hall, the Liberty Bell, and the other sites with importance in the nation's birth.
Although we did not have the time, an excellent way to insert this tour into a visit would be to use it as an introduction, as the walk includes identification of any number of choices for return visits and further attention.
By way of logistics -- booking and tickets were completely smooth and simple.
In short - highly recommended.