What are the strategies for traveling to Sydney and Melbourne in early July?

Travel to Australia on New Year's Day in 20 19, with 3 people traveling together for 9 days, and the actual play time is 7 days. I started from Shenzhen and went to two cities: Sydney+Melbourne (including Dayang Road). Excluding shopping, the total personal consumption is about 1. 15w RMB. It is best for four people to travel together, and it will be cheaper to rent a car and stay. One of our colleagues was refused a visa, which caused our overall consumption to be higher. But one thing, coffee money cannot be saved. When you go to Melbourne, you have to experience the coffee culture. Because cafes are a part of the life of local Australians, Australians can skip meals, but they have to go to cafes. Melbourne people don't go into Starbucks. They don't like instant coffee.