Here is a video made by Pink Rabbit Gaming showing the location of all 12 artifacts in the game.ATTENTION
it has 1 artifact that can be missed, so if you are starting the game now, watch all the video so you don't miss this artifact!
Edit: for some reason the items in the game is appearing on different floors.
Defibrillator: If it is not in the location shown in the video, look downstairs in a corner
Kommode 64: the same situation, if it is not in the location shown in the video, go downstairs and look near the table under the stairs