How has Melbourne changed since 2004?

Question

What are the main changes in the city of Melbourne since 2004? We lived in Melbourne, loved it and are moving back to next year for a safer, better life for our kids but have heard some reports that no one can afford a house any more and that it is getting increasingly violent and dangerous when it used to be one of the safest cities in the world...

Any truth to these rumours or why people are making these remarks?

Thanks