Final answer:
'Fit as a fiddle' is an idiom suggesting good health, it doesn't have a physical setting. The options suggested aren't applicable.
Step-by-step explanation:
The question is asking for the physical setting in 'Fit as a fiddle'. However, 'Fit as a fiddle' is a common English idiom used to describe someone who is in very good health, rather than a story or a book with a physical setting. Therefore, the options provided, a-bustling city street, a serene garden, an abandoned warehouse, and a spaceship in outer space, are not applicable to this idiom.
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