Pros: Amazing location! You can walk from the RER-B station (20 min), a metro station is around the corner, and there is also a Starbucks and a McDonalds that works until 2 AM nearby. Blazing fast Wi-Fi (faster than 100 Mbit/s).
Overall the apartment feels nice.
Cons:
The listing states that there are 3 beds - 2 doubles and a couch. The couch actually didn't have sheets when we came - we had to buy our own. We left them in the apartment - so there should be bedsheets and a duvet for the couch now :-) Also it's made from 3 sections, so might be not too comfortable to sleep on, but I was fine. Additionally, there was almost no toilet paper - bought some more ourselves.
The tap in the bathroom only had cold water and the shower was broken when we stayed. Also hot water runs out eventually if a lot of people take a shower consecutively.
The microwave is weird - we made it work by pressing the bottom button, then the top button, then mashing the center button/spinner 5-10 times.