Welcome to the world of the Cinquecento. As Ryan (Litrye) says, they are very simple cars, which any competant mechanic, with a copy of the w/shop manual, a set of metric spanners and a bit of conmmon-sense can work on.
Some words of warning----their performance is slower than the flow of much of today's traffic, and there are some truly AWFUL 'restorations' out there (see the messages on "overpriced restorations"). I would suggest that (a) you try and find somebody in your area who has a 500 and go for a drive in your local "this is where I am going to drive" area and (b) when you go to purchase your 500, you take somebody who you trust, along with you to look over the car with you and, (c) if you have any italian relatives, so much the better---they can help you with parts!