I'm argentine, married to a british, she talked to me about this community, it's my first time here.
I'd advise you to contact the dutch embassy in buenos aires upon entering the country so you get assistance on how to get around and so on, making some expat friends will also be very helpful as they will tell you straight how the deal is around here better than any argie can tell you, including me! haha.
There's crime yes, but it's not bagdad or mexico city. its slightly safer.. haha.
Now seriously: There's bad areas and good areas, as long as you stay around the good areas you'd never have a problem.
Theres towns like the ones we live in, you can leave the car keys and the doors open while you walk into the shops and noone touches your stuff, where there's other places that are not THAT SAFE.
Then again, the areas I consider safe (or unsafe) might not be the ones most of expats do, so make some friends here and ask them to help you get around.
The farthest away you move from ba city, the cleaner and normally safer, also more boring. Most of the population is concentrated in ba city and greater buenos aires area, past that, it's country.
Last but not least:
Argentina is a very big country you can spend several days driving from one end to the other, if you have a decent income here, exploring argentina is such a beautiful experience.
Me and my wife discovered a beach called Mar De Las Pampas just a couple of months ago, it's hidden deep inside a big forest of evergreens and sand hills. Recommended, super safe and clean.