I like going to flo's because it's kind of hidden in yorkville. Only people who know Flo's ever go to it which means it's usually not that full and you can always get a table. They have a big patio on the outside with lots of umbrellas and a diner feel on the inside. Sometimes the service is slow just because they don't have much staff working.
I'm a fan of the all day breakfast thought I always get my favourite - grilled cheese with sweet potato fries. The grilled cheese is amazing, especially because it is served on this thick egg bread so it is also very filling. Also, there sweat potato fries are delicious - always upgrade when you can.