Although the apartment has a very central location - just beside Châtelet metro station - it has multiple issues:
1) The WiFi is incredibly slow - the last two days of our stay it just stopped working.
2) It is extremely loud at night - next door neighbors have parties almost every night.
3) The door cannot be locked from the inside - and at least while we were there on the first day - the cleaning person randomly walked in our room without knocking.