One of the best locations one could ask for in Paris.
The appartment is very spacious, all rooms are big and amazing views on city hall and rue de Rivoli. Only one room faces the street though and the other rooms are facing the indoor courtyard - which is relatively more quiet. The living room decorations could be improved but there is everything one needs and everything was very comfortable.
Yes as other reviewers mention the floor wood is old and noisy at each steps but I never heard any neighbors complain when walking around. These reviews seem old and nobody will bother you directly.
If you are a late sleeper or jetlagged, beware that the appartment across the hall is professional office that receives a lot of visit during office hours and you can hear the elevator use and their doorbell ring from the courtyard facing bedrooms (the room facing rue de rivoli may be the best option then to sleep at, as the street is actually really quiet).
There is also smart air conditioning and heating across the appartment (air conditioning is rare in Paris so a big bonus for the summer).
Overall, I loved it and will definitely stay there again.