We were enjoying a very pleasant stay in this appartement! It was very clean, well equipped and perfectly situated in the lively Quartier Latin. With windows closed it's very quiet. However, if you need to let open the windows during night (as we had to do because it was very hot in that time) it can be noisy.
It was the perfect place for us to spend a couple of days with our three kids in Paris, we can really recommend this appartement!