And with large enough chambers, I don't see why an underground city might not actually resemble a surface city with roads, alleys, enclosed yards, market squares and rows of constructed buildings. There are literally enormous open chambers found in Mammoth Caves, Carlsbad Caverns and other actual underground cavern systems on Earth. There's no reason why a surface looking city could not exist underground.
Nobody builds a surface city where there are no resources to support it. So I wouldn't think an underground city would appear anywhere there is an open space underground, if the supporting resources aren't there, neither is any population. There needs to be the basic resources to support life at any location for a city to be founded.