A Guest of Ganymede by C.C. MacApp

It developed that when the robot spoke of days, it meant a twenty-four-hour cycle of light and dark, with temperatures to suit. Under other circumstances, the place would have been comfortable.

The pantry was stocked with Earthside food that didn't help Murdoch's confidence any, since it was further evidence of the aliens' contacts with men. He cooked eggs and bacon, helped Waverill eat, then washed up the dishes.