Location : Great, within walking distance from many touristic spots. Unfortunately, that's the only positive I could see from this trip.
The place is smaller than it looks in the photos. The water pipes made an annoyingly loud noise every time you turn it on. It's huge let off for someone with a family. Every time someone goes to the bathroom or uses kitchen, everyone else is woken up by the noise the water gushing through the pipes make.
The wifi was working sporadically and is not easy to configure initially. Asks to reconnect everytime we come back home. Downloads don't happen sometime.
I'm not sure how the security works in Paris, because it is just a number based key you enter to get in the apartment. It doesn't change for every booking. Personally, we didnt have trouble with the security but it is a very bad feature to have a number based lock which can be opened by anyone who knows those 5 digits.
In short, great location-wise and may be cheaper too compared to other listings around.