I've worked from a library a few times recently. Security is important, but there are libraries that don't have this problem (might depend on the country, though).

Other points I personally regard as features that help me focus. If wanted to get some food, I'd go to a café. To meet someone in person or make calls, an open space (if there isn't any, a café) is a decent option. But if I want to concentrate on something for a couple of hours, I personally go to a library.