If you purchase appliances you do not have to tell your landlord but it would be advisable to do so, as would getting him to sign a letter stating that such appliances are your personal property.  This way, when its time for you to move there will be no question about their ownership.As for getting the rent lowered, you could try; however, there is no legal requirement that the landlord provide a refrigerator or stove.  You may just want  to look around and find yourself a rental that does include these items.