If you have experience of the London rental market, there is but one way you can react to a game – a French game, no less, the cultural product of a country where two-bed apartments apparently grow on trees – that promises to maroon you in a sprawling labyrinth of flats. “Haha, alright for some!” you chortle despairingly, after freeing yourself from the laundry basket and retrieving your trousers from the fridge. “I bet labyrinths have more than one window,” you sob, as you yet again tackle the...