3rd year mathematics undergraduate, looking for accommodation in Paris for summer 2019

I am a 3rd-year Mathematics undergraduate at the University of Bath, United Kingdom.

I will be doing a research internship at Inria Saclay on a project on probability theory and statistical analysis and cyber defense, for which I shall be in France over the summer (June to September).
I will be extremely grateful if I could get a budget-friendly accommodation for the summer.
I am a very easy-going and flexible person, who likes to spend most of his time doing maths or programming. I am thinking of renting or buying a bicycle, so the commute to Inria and Ecole Polytechnique would not be an issue for me. 

I would like to have my accommodation finalized as soon as possible.