This place is not only in the heart of Florence, but in the center of the heart of Florence!
A five minute walk from the central market( Mercato Centrale) and about a three minute walk from the Duomo.
The apartment and the service is excellent, they have an office near the central train station where you can leave your luggage while you wonder the city:)
The only thing that needs to be fixed is the shower. It either gives you boiling water or freezing water, no middle ground. That's the only complaint I have. But even with that, it's still worth the price and comfort. Modern, two bedroom with the main room in a loft style mezzanine, fast internet , coffee machine and an excellent kitchen.
I will definitely recommend Luca&Abla!