I was there in May. Lots of bikes, but I didn't see many fixed gears. Off the top of my head, I remember one in a shop window and one locked up outside a shop. It seemed that most bikes were older, well-worn, upright 3-5 speed cruisers/commuters. There were several places to rent bikes, but probably not fixed gear. I think there were even some places where you could pick up a bike in one part of the city and drop it off somewhere else. The stands looked like a cross between an electronic bike rack and a parking meter. Not quite sure how they worked, but it seemed like a cool system.

There's a lot of traffic - cars, buses, scooters and pedestrians. Might be a little chaotic getting around in the daytime, but things calmed down a lot in the evenings/nights. I definitely wished I had my bike while I was over there. Although I think the rough cobblestone roads might have rattled out a few fillings after a couple miles.