As mentioned before, the appartment is not soundproofed at all. At least not regarding the entry floor, we never heard anything from the other Appartements but as soon as people talked or moved in the entry area of the building it felt like they were standing in our appartment. However, we were able to sleep peacefully anyways but keep that in mind in case you have a light sleep. Besides that, the appartment is really cute and equipped with everything you need! It was clean as well and we felt really comfortable. The check in was practical and easy. A grocery store and a bakery are nearby and next door is a kiosk, which is open almost all day and night. Walking distances to almost all touri spots (eiffel Tower, Louvre, montmartre) is approximately 1 hour (of course you can take the subway as well).
Thank you Helga for letting us stay at your place, we had a great time!