Location could not be any better. It was right in the center with everything (metro, bus stop, bakery, pharmacy, grocery, etc) right around the corner. As most of buildings in Paris, the apartment building is old. Very small elevator (barely big enough to squeeze 3 people at once), you can also hear everything around you, but it is pretty quiet neighborhood. The neighborhood felt relatively safe overall. Beds were spacious and comfortable (including the sofa bed). There is a microwave now. As other reviews said the wifi info included in the packet was wrong. However, you can look into a white disk looking router in the 2nd bedroom, and it will show the SSID and the password. I've let the management know, so maybe it will get corrected in the future. We were also able to check in early since there was no other booking the day before our stay.
The only issues were lack of many basic items as others stated (not many glasses, dishes, cups) for the number of maximum people the place is supposed to accommodate. We also had some difficultied with opening the trash bin door and getting the magnet key (VIK) to work properly. But thankfully there was a concierge lady near the recycle bin door who was able to help me.
Overall, it was a great stay for our family of 6, and we were quite content with the place.