Usually 72° F / 22.22°C. But my wife likes to turn it down on the really hot days were the AC doesn’t quite keep up. I try to explain the AC is running all out, turning it down does not help. And we certainly do not have one of the high end units that can throttle, it is either on or off.
At some point it will freeze up, stop working, and you can say "see?!" while it thaws. But no one will acknowledge you were correct and tried to warn them. But you'll know.
Metal and ceramic on the bottom, glass and plastic on top, bowls overlap no more than 50%, spoons and forks all curve in the same direction. Run it on express wash with no heat, remove to the drying rack when done.