Our room was ok. A little small and with weirdly shaped spaces, but it's the same situation in most affordable hotels in Paris. The staff was friendly.
One very uncomfortable thing though: we were on the 3rd floor, but still hearing loads of noise coming from the heavy car-traffic street down below.
As the A/C was not really working properly, we had to keep the window opened.
Be warned, it'll be hot, and noisy as hell.