When you say urban environment, what are you intending to use this for? Is it more for everyday use, or emergencies? I have something similar, but with different items, mine's more for just everyday items. BTW, I like the pouch you're using, what kind is it?

What do you plan on using the space blanket for in the city? I usually carry one around when hiking, but rarely ever use it. For an urban area, maybe a cheap poncho might be more useful or even a large garbage bag.

Also, I agree with replacing the matches with a mini bic. Much easier to use for lighting almost anything on fire and you get a lot more life out of it.

I have a couple of safety pins and a tiny sewing kit. Safety pins are pretty useful for rips in clothing, and the needles in the small sewing kit are good for removing splinters and a lot of other stuff.

I also carry a Fox40 whistle, but I'm thinking of leaving it in my hiking backpack. Never really needed a whislte in the city.

I don't carry much in the way of first aid aside from a few band-aids. I keep a fully stocked first aid kit in my car though. I figure if there's something serious enough that requires more than a band-aid, I'd probably call for outside help. Never even thought about carrying burn cream, do you work around fires where there's a likely chance of getting burned?

I also carry a tiny button compass, it's actually pretty useful when walking around.