I think this article sums up the 500 really well. It's certainly the best one that I have read that sums up the driving experience so well.
http://www.motorsportmagazine.com/road-cars/opinions/the-joys-of-fiats-original-500/
http://www.motorsportmagazine.com/road-cars/opinions/the-joys-of-fiats-original-500/