I wanted to recommend three dinner spots in Florence.
The first one was recommended by our Airbnb host. It is called Trattoria L'Oriuolo on Via dell'Oriuolo 58r in Florence. It is a nice neighborhood trattoria away from the throng of tourists. The food was delicious and well priced. It had a nice ambience and I would definitely go again. They also had great wine choices.
We followed Rick's advice and ate at the Mercato Centrale. I highly recommend this. It is fun. Tons of food choices. We sat down at the bar area, ordered some drinks and took turns perusing the many food stalls and then ended up sharing with each other. There were 5 of us so lots of sharing and lots of fun!
Finally, I downloaded the Eat Italy app which Rick talks about and found the restaurant where we ate our last night in Florence. It is called Trattoria I due G. It is not in a picturesque part of town actually very near the train station but we had a delicious steak and pasta. One steak fed 3 of us. Many local types - we might have been the only tourists in there. Anyway, food was delicious. It is small, quaint and unassuming. Also, good wine choices here.