I'm a coffee addict and for the last two years have been to a bunch of SF coffeeshops, here are my favorites! It's been a while since I've seen a post about this on BF so please add if you have others too!
Saint Frank (Russian hill + Fidi locations)
Laptops allowed on weekdays, great Wi-Fi, no outlets in either location. My favorite coffee in the city.
Verve (Castro location)
Has outlets, great coffee, I've taken meetings here before as well.
Haus Coffee (Mission)
Only one outlet (hanging from the ceiling), quiet and great place to work. The few times I've been it wasn't the best spot for meetings.
Noe Cafe (Noe)
Amazing people, even better coffee, more grab-and-go, very quick service
Kopiku Coffee (Pac Heights)
Favorite in the city, amazing Indonesian coffee, but limited seating & always busy so not the best place for working.
Home Coffee Roasters (Chinatown)
Has seating, usually crowded, coffee is amazing and worth the trip. I used to go out of my way from Fidi to climb the hill to get here.
Outset (Fidi + Mission)
Multiple locations, seating varies, Caramel Banana Latte is amazing. I don't believe there are outlets.
Golden Goat Coffee (South Beach / Mission Bay)
This was my go-to during YC batch, near South Beach, quick service, great coffee and people - more of a hole-in-the-wall spot.
Honorable Mentions
Ritual, Four Barrel (Mission), The Coffee Movement, Flywheel Coffee Roasters (Lower Haight), Fiddle Fig Cafe (all the outlets were taken when I got there, but they do have outlets) also most Philz do have outlets and wifi so that's always a great option when in a hurry haha