We (two adults and two small children) stayed here for six nights. The apartment was ok and as shown in the pictures. We did not have a great stay however due to severe noise problems! Marais' most popular falaffel place is right outside the window which makes is an incredibly busy place - and very noise all day, from when the garbage truck comes every morning at 7 am and until midnight when the falaffel shops close and the load music is turned off.
The windows are not double glazed as it says in the add - but single glazed and unable to stop very much of the noise.
You are also able to here everything that goes on in the apartment above (also airbnb rented), which woke us up numerous times in the night.
All in all the apartment is fine, but the noise makes it unfit if you like to get a full nights sleep between 23 pm and 8 am.