will be staying with my cousin

Hey there,

Have a question regarding accommodation proof. My cousin studies and lives in Beijing and I was going to stay with her. Will providing her address be enough to prove i have a place to stay?

Plus, will providing bank statements alone be enough or I am supposed to have certain amount of money saved up or whatever? And if I should than what is that amount? Per person? In case I am traveling with somebody and going to pay for them?