Where is the best place to go to find cheap apartment rentals in Paris, France?

Question

We are going from August 15th to October 9th, there are 2 people total in the room, we're looking to pay less then 750 €/month.

Answer 1

French people have already trouble to find appartments at that price for a full time renting, and inside Paris, you will have a single room for that price .

Don't worry, it is worst in London ^^

Maybe try exchange of appartments or house, it will be easier and surely cheaper,

Answer 2

Under a bridge?!

In Paris, you can't expect better for less than 750€/month. The Parisians rental agencies don't know the word "cheap" !!  

I hope you'll find what you're expecting...