I was born and raised in San Francisco. I still know where to find the authentically SF establishments.
My favorite neighborhoods are the Mission, Excelsior and Bernal Heights. I know where the best tacos and pupusas live. I can also take you to the best mango margarita everrrr. I have a favorite rooftop bar which I can definitely show you. If you love chocolate chip cookies, I can take you to the best ones!
I don't care for touristy stuff so I will never take you to those places (unless it's what you're into).
SOMA neighborhood is overrated btw. I wouldn't waste too much time in that area.