https://en.wikipedia.org/wiki/Piotrkowska_Street
And yes, as I wrote, it is the main axis of the city, even if other neighborhoods branch off of it. This is a basic obvious fact about the city:
From the very beginning this street was the central axis, around which the city grew bigger, and its development spontaneously gave the present shape to its centre. At first the city was mainly the highway, but later it changed into the city's showcase, the leisure and shopping centre, where the life of growing industrial agglomeration could be observed.