Me and a friend stayed in Marusca's Apartment for two weeks. Marusca is a very nice and welcoming person, I can only recommend to stay in one of her apartments.
The Apartment itself is clean with a very nice kitchen, everything like on the photos. The beds are comfortable.
Location of the apartment can't be any better for sightseeing , you'll find yourself in the middle of the historical center of Florence.
Just be aware, that you might be confronted with singing (drunk) tourists during the night and hotel deliveries in the morning, but that's the only traffic on both sides of the apartment.
I would stay there again.