Australian for 3 mths vacation to Montpellier! Pls Help!

Hi, im vince and i wanna go for a 3 months vacation to Montpellier, france to see my girlfriend and i have a few questions.

1. Do i need a certain amount of money on my bank account? if yes, How much do i need?
2. Do i need an accommodation letter? ( i'm staying at her place with her family)

Hi
you come to visit your girlfriend in France for 3 months so you don't need anything.
You have a tourism Visa , that s all.
enjoy your stay

alrighty thank you so much :) tc