It might be hard to find an authentic restaurant so close to the Duomo and other main sights, but Trattoria remains a hidden gem amongst the throngs of tourist traps. The staff is wonderful and happy to assist, and the specials are always unique but true to the typical taste of Tuscany. Also, if you are thinking about experiencing a plate of gnocchi at its finest, this is the restaurant to try it out. They serve several different kinds, but the best is probably the simplest--you might want to consider the tomato and basil. Wine is also cheap and quite good, and the restaurant offers a relaxing atmosphere for guests.