Are there mosquitoes in Italy? Hell, yes. Unlike India, Afghanistan, and a few other countries, the mosquito bites in Italy don't give malaria or other mosquito-borne diseases like dengue or Zika, but they are incredibly annoying.
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Avoid wandering around town alone late at nightProvided you keep your wits about you and use common sense, you should feel safe and comfortable in Florence. Still, we'd advise avoiding the Santa Maria Novella area late at night when alone, as well as narrow dark alleys.
To reduce the possibility of a mosquito biting you, you could consider wearing white, green or blue. Lighter colors are less interesting to mosquitos than darker shades like navy and black, red or orange. However, clothing color alone is unlikely to keep mosquitos away for good.