We stayed in Guia and Jacopo's for two weeks. We did encounter mosquitos in November too, but there were repelling plug-ins and they took care of the problem.
Unfortunately the dishwasher was not working and the host was unable to fix it, so if it's important to you, do ask if it has been fixed. The host was very nice and responded to all our questions and inquiries quickly. The location is very nice, an easy walk to everywhere one needs to see in Florence yet not in the center, so it was relatively quiet. The neighborhood is very nice.
The bed was super squeaky, but I think it's easily fixable, so should be taken care of by the host. Otherwise the bed was very comfortable and new. We liked the quality of linens and towels too.
All appliances work well (apart from the dw), shower pressure is good.
A small vegetable market is right outside. There is a nice food shop very close by too. We do recommend this place and would gladly stay again as long as the dishwasher is fixed.