We don't know too much about the speaker—we don't even know the speaker's name or gender—but we are darn sure of one thing: the speaker loves Chicago. Like, really loves it. The speaker and Chicago, sitting in a tree. K-I-S-S-I-N-G.
And in some ways, this is all we need to know, as the nameless genderless speaker can represent all those Chicagoans—or anyone, really—who love their city. The defining characteristics of this speaker are pride and joy: pride in celebrating the character of his (or her) home city, and joy at being able to share that proud feeling with us, the readers.