Played this game with a group of friends to create a city for us to set another game in, and it was super fun! Really was useful for creating a city where everyone felt invested in it and knew what was going on, and gave them a chance to introduce some interesting elements to the city that I, as the GM for the game we're going to use our city for, never would've considered otherwise.
We probably played it a little fast and loose compared to the intention of some of the rules, but everyone had a great time with it, and I super recommend Street Magic both on its own, but also for how it invites worldbuilding and player contributions for use in another game afterward!