Pros: The appartment has been extremely well renovated with nice finishes. The appartment is also surprisingly quite at night ( passed 10pm). The location is great with lots to do all around and can easily walk to Le Louvre (18min). The host was very responsive and easy to reach.
Cons: While the appartment is nice, it is extremely small, thus was really not ideal for a family of four. Once the sofa bed was out, there is basically no more space to move in the appartment. (if you are just a couple traveling, this should be fine). The appartment is on the 4th floor with a narrow staircase to get there, so careful if you have large luggage or very small children. The appartment didn't have much (only one roll of toilet paper, no shampoo or such things) plus there was food in the fridge... you certainly felt you were staying at someone's house.
All in all, we had a great time the beds were comfortable (which is always important!). Giving 4 stars mostly because it did not work well for a family of 4.