Just an idea for settings, based on the other profiles I read.
Base for the Scandinavia gang (or some meet-up place at least)
Base for the Britannia gang (or some meet-up place at least)
Brothel for the prostitutes (if they're all at different brothels then we should make more than one)
Egypt's shop in the Black Market
France's cafe
I am not sure where Italy and Swiss will be having a "base" for their jobs, or if they just wander around. So you'll have to ask them on that. Although just a personal note that can be ignored, I'd think Italy would want a church somewhere near by at least...
From the characters who do not have profiles yet I know for certain will be needed:
A club for the exotic dancer Turkey
Base for the Mafia (cause there will be one)
So far the only things I noticed that will be really needed in this RP based on the characters. Otherwise, some general things would be to include a general Black Markets that's more than just Egypt's shop, other brothels with NPCs (because sometimes we may just want our characters to go there, without the smut or even without talking to the pros, so instead of bothering the characters who are prostitutes and won't be interacted with it's better to have an NPC brothel of a sorts), other NPC shops, clubs and cafes. And as silly as it sounds, maybe a section for streets? Only because they're not always going to be in places when they meet up. They'll more likely meet in the streets or alley ways.