The noise generated by appliances such as a compressor in a refrigerator or the spray nozzle of a dishwasher resides well above the bass regions, and good old absorption and isolation is the key here. The first thing you should do, as suggested above, is mechanically isolate the refrigerator from the floor. Just as you would decouple your TT, you don't want the vibrations of the refrigerator to interact with the floor and walls translating into noise. Many times, this alone is enough to satisfy. If not, I would try free-standing absorption in your listening room with an air gap between the kitchen wall and the absoptive panels.
The creeking floor is the hardest... That would certainly require intervention and a mechanical fix from the landlord!
The creeking floor is the hardest... That would certainly require intervention and a mechanical fix from the landlord!