I do like the idea of #2, and since all but one of my current stories have ended prematurely right now I think I'd be willing to take on another one.
I can't say I'm really familiar with European cities though, so I'd be making stuff up (or looking it up as we go). Perhaps a clueless but well-meaning American would work well then. :)
I've had a hankering for a touch of exhibitionism/voyeurism in a story, but hadn't figured out the story around it. Maybe we could work a bit of that in? We can chat by PM or in this thread for more details...