The problem with being a quietly excellent bakery and restaurant in Philadelphia is that you have plenty of good company. The understated quality of the dining landscape means that greatness abounds. The kind of spot that, in New York, would have lines around the block can easily operate as a low-key neighborhood staple in Philly. Fiore, for example, is an all-in-one restaurant, bakery, and daytime café, that rare food business that manages to do many things very well, all at the same time. Towers of vanilla cream-filled bomboloni perch on cake stands, maritozzi smile their creamy grins, and cakes are in various states of sliced-ness, giving a lived-in feel to a pastry case that makes ordering an extra slice or two feel entirely reasonable. Yet, you could walk right past the door and never realize that inside is one of the best Italian bakeries in America. Not Italian American.…