The accurate statements describing northern Italian Renaissance city-states are:
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Guilds maintained standards for anyone working in their craft in a city-state.
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Early Renaissance cities were crowded, dirty, and dangerous.
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Renaissance cities were slow to grow because most business was conducted outside the city.
The statement about the governments of most Renaissance city-states being controlled by princes or kings is not entirely accurate, as many city-states were governed by councils or oligarchies rather than being solely under princely or kingly control.