Thanks all for the input!
I have a follow up question of sorts. I started this thread because I am looking for a good home-base city for the group I'm DMing. The rest of the time, they'll be battling the horrors of Rappan Athuk. As such, I don't think much adventuring will be happening in the city, but I would like a supplement that is easily adaptable and provides plenty of resources (i.e., NPCs, locations, etc.) to assist me when the PCs go looking for supplies, assistance, etc. The less work I have to do in this area, the better.
I had planned on using Freeport, but it doesn't have as much detail as I would like (not many locations, few plug and play NPCs, etc.). I have sort of been debating between Bard's Gate and City State of the Invincible Overlord. What would you choose if you were in my shoes? Bard's Gate, CSIO, stick with Freeport, of another?