Australia has a population of over 24 million people and is one of the most di places in the world. It has com a long way from his convict background to become one of the leaders in education. Their tier one university are within the 2 % in the world and with universities like Monash universities and Melbourne university ranking often in the top 1%.
The most popular place to study in Australia would depend on what you like and on your budget. If you love the idea on sunshine all year round, then queen land is the place for you. If you like the having a busy night life and cafes then Melbourne or Sydney are fanatic choice and if you like the idea of peace and quote when you study then South Australia is the Place for you . Each of the city one if not two major universities that offer both online and on- campus learning options.
For the most part Yes, there has been some instances in the past where attacks on students have happened that seems to be racial motivated but that seemed to be an isolated incident and regardless where you go you will never be 100% safe. Australia is made up of a wide variety of students from different background and they work in harmony every single day without any issues.
I love studying and living in Australia. It is unique and one of the best places in the world to study any course and have a amazing life style as well. Having said that It is not for everyone, living costs are very high so you want to make sure you has sufficient funds in the account prior to make the decisions to come to Australia and Study.