overall, I give it 5 stars because the stay delivered on everything at a relatively good price point. We chose La Louisiane primarily because of price, location, and key amenities (elevator/lift for our large luggage, and a hairdryer)
positives first... the staff was welcoming and friendly, there were lots of restaurants and shops, including a supermarket, close by. There are enough major sights within a 10-15 minute walk to keep you occupied for a couple of days. There are also bus stops, and stops on the metro and RER that can get you around the city, and to the airport, effortlessly. The WiFi worked well for the most part. The sheets and towels were turned over each day. The staff were also accommodating; we were able to secure late checkout (10 euro fee) when our departing flight time changed.
some negatives... a fire alarm served as a rude awakening one night (11:30pm). The room we stayed in was mostly clean, but showed some age with scuffs in the carpet, dirty grout in the bathroom and peeling wallpaper. Our room overlooked a street (Rue de Buci) that was very loud in the evening and early morning (6am deliveries).
finally, some nearby recommendations! For lunch or dinner head to La Jacobine (5 minute walk). For dessert try a caramel eclair at The Smiths Bakery (1 minute walk).