At what setting/temperature should I keep the VR1?

The recommended thermostat setting for the VR1 is 5.

We recommend keeping the VR1 at setting 5 (typically 36-38°F) for optimal food and dairy storage. If the fridge is to be used as a beverage center with no dairy it can be used at a lower setting than 5. We do not recommend running this fridge at on setting 6 or 7 for more than a few hours. Leaving the fridge on setting 6 or 7 will cause the fridge to work harder than normal and could lead to a earlier than normal failure of the compressor.