Your Secret place in Florence is...
The Piazzale Michelangelo was built on the hill south of the historic center of Florence following the design of the architect Giuseppe Poggi. Florence was the capital of Italy in this period, 1869, and the entire city underwent intense urban renewal, the "lungarni" (the streets that follow the course of the Arno) were created; on the right side, in the place of the 14th century walls, the Circunvalación was opened and on the left side an 8 km tree-lined panoramic street was traced, currently called Viale dei Colli, on top of which Piazzale Michelangelo was built, as a panoramic terrace over the city.
Also do not miss this Rooftop
View on Art Rooftop
Located at the top of the Hotel Medici, right in the heart of Florence, View on Art Rooftop Cocktail Bar combines a casual atmosphere with some seriously great views. The fairly basic but charming 6th floor rooftop has both an indoor lounge and an outdoor terrace, where the main feature of this place is the amazing up-close views of Brunelleschi's distinctive dome and Giotto's bell tower. Usually open from noon to midnight, this is the perfect Florence rooftop bar for a relaxing drink with the best views of the Duomo.