Nox's house is in the Red Light District so Nox's house. It's two 'doors' down from Kallisti.
The Carnival is with in walking distance of the Red Light District. (I has a map

if you wanna see)
And the Red Light District (specifically Kallisti) is with in walking distance of the Red Square and the Kremlin as Ori wanted Kallisti to be right in their 'view'.
I like the idea of having 'categories of play' but I think it might be more confusing location wis
Outside Town sounds like a good board to have.
The more and more I think about it I think I really like the idea of the "Action/Location" of the thread.
Nightlife could become
Entertainment - and the Carnival could go here
Market could become Commerce District - and all shopping could go here I think it does mostly anyway so leaving it The Market is probably fine.
Residential for all the 'personal homes of peoples' and probably should encompass the hotels so something better than residental.
Residential and Hospitality.
Government Facilities to include the Guardian (and the detention center)
The Suburbs for outside of Moscow Though I don't think we have many threads there.
I think breaking the residences should go a long way in helping out the greater moscow board.
I was thinking maybe you could break it up into quadrants? Or maybe the rings of Moscow?
(And I'll survive if you make sub forums, they just annoy me)