Remote coder here, this is my jam. I can get a whole conference room all day and kick back in my local library, which I can lock behind me if I want to jump out to use the bathroom or eat. Granted, this is in Fairbanks, not LA or SF :)

But even living in Boston I never saw the libraries super packed, usually plenty of room in the top-floor old-school reading room at the central branch on Boylston. Maybe not on holidays, but those sucked for cafes too in the city–better to just stay home or not work those days.

Internet can be a crapshoot, but I can do most of my work tethered to cell anyways. I always have that one cafe with awesome WiFi I can go to for downloading OS/IDE updates.