People tend to check in during these times:
Unassuming diner. Very sparse. Makes a decent burger.
Awesome breakfast. Great coffee.
Cheap, decent food. A great place to study or write, as they have bottomless coffee.
Open 24 hours, good when there's nothing better open in the FiDi
Great comfort food and inexpensive for the neighborhood. They will remember your order.
Best blueberry muffins I've ever tasted, also open 24hrs