I wouldn't think nobles or anything like that, but there are the general classes: High, middle and lower. the city has no "Authority" other than the police force, and even they don't do much. its kind of universal in Arom that it's neutral ground for races, and organizes itself, if that makes sense. nobles from other parts would travel through or take vacation there, though.

and yes, I there would be various guilds and organizations. :)