Re hardware issues , it's to do with noise and surprisingly "wind tunnels "- somewhere within the room possibly vents and electrical purring but not the fridge . That was my room which was overall wonderful ( views , balcony , roof tops , Eiffel etc ) and I didn't bother to move as a result .
A friend staying in another room wasn't so lucky with noise but alternatives offered disappointing .
For sure the service needs some warming up but then they do have solid staff there so that's a good start . But the management would need to review some policies and also to greatly improve the breakfast menu .
Didn't try Ecrin, not really keen either .
Overall , it's a fine and solid redone hotel in an excellent location ( for that area )
Re Lutetia ... still a long way to go from outside - hoarding and building noise is still apparent .