Bohemia is presented in this passage as it says in the italics above it, it was a bohemian world, a world of individuals who pursued unconventional lifestyles. And the phrase they're referring to here is Bohemia bordered on the north by hope, on the south by necessity, etc. So you're not talking about an actual place, you're talking about A, an extended metaphor for a place. Bohemia is a state of mind that they kind of describe as a place.