I'd be carrying my Mossberg 500 (7-round tube with a shellholder on the buttstock and a shell belt loaded to the gills with 00 Buck). My girlfriend would be closely BEHIND with the AK. Both of us would have CZ full-sized on our hips. The Uzi, the other Mossberg, ammo, and my other pistols would be buried somewhere in the house so the STINKING COPS and ARMY couldn't take them from me (anyone else learn anything from this?).
Staying close to walls and keeping a good lookout would help prevent any sniping from rooftops. I'd move while she looked for shooters, leapfrogging.
I know this sounds lame, but I've played paintball from the time I was 15 (I'm 32). I've played all across the country and Canada, in both recreational and tournament games, in the woods, indoors, and in "urban" situations. I even got to play in the Mansfield Pen (where they shot Shawshank). I know how to move, I know how to keep an eye out for movement, and how to watch my partner's back. So does my girlfriend. It's second nature to us. This is a huge advantage in any given situation. The only problem is that I don't get to start over in 20 minutes if I get hit.