When I arrived I was assigned a room. I got up to it and the keycard was not working. Going back to the reception they updated the keycard. Got back up and could enter the room.... which was occupied !!! The person was not there but the room was not done (bed messy, used cups on the desk, a letter for someone else on the bed...)
I got back to the reception and explained the situation. They told me to wait to find another room.
I would have expected at least some sort of compensation coming from a 5 star hotel, should it be a room upgrade or even paying for a drink of my choice while I was waiting after a long trip. None of this was offered (they did tell me they would offer a hot chocolate, thing that they offer to everyone, but at 9PM this is a bit surprising).
Other than that, the rooms are quite ok (rooms are usually quite small in Paris) but very noisy during the night with traffic, so much so it was hard to find sleep.
Beds are very confortable though and pool / sauna is a good plus for the hotel.