We (myself, my husband, my young daughter, and my colleague) stayed here while teaching a short university course in Paris. The apartment is perfect for two couples - or, in our case, a small family and a friend - who enjoyed the shared space but also the privacy of the bedrooms located at opposite ends of the apartment.
The two full bathrooms made mornings easy and the fantastic kitchen had everything we needed to cook meals. The whole place was spotlessly clean with extremely comfortable beds - Joy even went above and beyond by providing a small mattress for our daughter so that she could sleep on the floor in our room.
As the description notes, the apartment faces a boulevard, so there is some street noise (you are in Central Paris, after all) but the curtains\shutters help to minimize this and the back windows can be opened to provide cool air at night.
We would definitely stay here again - highly recommended!