The stay was about as expected but security is a bit of a concern. It is common in Paris to leave your hotel room key with the concierge when you exit but in doing this practice you do not have to verify your identity when picking up a key.
Our identity was never matched to our room by the night clerk who had not processed our check so in theory, if you know a room currently occupied that isn’t yours, and that key happens to be present, you can retrieve it without any issues.