The problem was not solved to my satisfaction as basically the staff I informed of the incident did nothing: there was no check where the screw come from, no cleaning, no follow up (I had to go to the doctor in emergency). Rest of the stay was as the beginning: breakfast staff do not take order request (there is now a small menu at breakfast on top of the buffet), young desk staff with zero experience.
Breakfast is still excellent.
Here are pictures of the Junior Suite: