The challenge with shooting wide open in the streets is that things move quickly. In the time it takes to adjust focus, the next shot can be gone before you can press the shutter. This is where zone focusing comes in.
I’m not much of a portrait photographer, but I’d like to get better at photographing willing participants. That includes barely willing participants, as strangers in the street often are.
There’s a pretty basic set of things that makes city streets attractive to me as a photographer. Good light. People out and about. Interesting old and new architecture. Stockholm has lots of all that.