We had a very good experience renting through Windows on Tuscany
In May we rented a very nice two bedroom, two
bath, two level apartment in Florence, a few blocks from the Duomo. It was
everything they promised, the cost exactly as quoted, and one of their
representatives (a delightful young American woman) met us at the apartment
when promised. Of course, they rent properties in the countryside as well
as in the towns and cities.
Have a great time!