I also live in an urban area (Chicago) and started riding about 3 years ago. So far I've had spaces in parking structures where I could do some less involved things (changed my own oil a few weeks ago, wheee) without raising too many eyebrows. I'm currently condo shopping and one of my requirements will be an indoor garage space so I can continue doing this, so it's do-able in an urban environment. I guess I don't really know what condo garages are like in Europe though...
As for risk, there's the HURT report in the US that came out in the 80s but nothing nearly as comprehensive has been done recently. I just make sure to always wear All the Gear, All the Time (ATTGATT), and always ride sober. Even one drink is pretty noticeable. So there's ways to substantially reduce the risk.
As for risk, there's the HURT report in the US that came out in the 80s but nothing nearly as comprehensive has been done recently. I just make sure to always wear All the Gear, All the Time (ATTGATT), and always ride sober. Even one drink is pretty noticeable. So there's ways to substantially reduce the risk.