This is the city of mine so far that I think is the best. Three large insulae blocks provide the population and a block of 4 large villas ensure the prosperity. Trade is maxed out and industrial production is sufficient to prevent devolution of housing. If anyone has any tips or sugestions, I am still new and would love to help. Please e-mail me at (email@example.com) or check my posting on large insulae city help in the forum pertaining to this mission.