Just dig a hole in the floor and pop a paving slab over it
A fridge with the thermostat turned up to warm.what are the options for storing food and drinks that are cooler than a typical cupboard, but not as cool as the fridge
My parents live in an early 20th century agricultural worker's cottage and it has a pantry which is very handy as a cool dark space for storing food.
Not much option for that in a modern flat!