I stayed at Le Louisiane for 4 days during a business trip in Paris.
I found the hotel absolutely perfect for the price I paid (roughly 40% of the price of any hotel in the surrounding area). The rooms were spacious and clean, the bathroom was restocked with amenities daily, the breakfast was decent and included in the price, the wi-fi was top-notch, and the staff were kind and efficient.
This is not a very beautiful hotel, it is quite old and the furniture is basic. But you can feel the place has history, the layout of the floors is ridiculously funny, and the posters of the movie made about this hotel laid out everywhere make you feel like you are walking in the footsteps of stars.
I strongly recommend this for people looking for a cheap hotel that provides all the necessities a tourist or business traveler would need in a great location.