Tips and experience running a city campaign

[Xeriar]

I was wanting to appeal to the collective experience of the players and GM's who have run/played in a city campaign.

I'm going to be starting one, and I've got some good ideas, but I figure knowing what makes a city campaign successful could only help me make the game better.

I'm going to be using the Bluffside campaign setting, and I want to keep this a true urban campaign.

Any thoughts?

In Legend of the Five Rings, one of the default gaming styles ended up being the 'magistrate' campaign, where the players would be magistrates and their assistants (yojimbo, hangers on, etc.) This wasn't intentional, it just worked out that way.

It's a bit difficult for d20 because the system is a lot more inflexible regarding skills, and the power-span is more dramatic (some say ridiculous .