The look of this place reminds me of the restaurant Patsy's Pies on the Showtime series Shameless!
It's only open for breakfast and lunch, but what makes Kristina's cool is that you can get a meal and drink for around $7 + tip. You can get a solid breakfast for about a dollar or so less. I used to live in this neighborhood and still work in the area, so I try to hit this place up from time to time.
Today I had the patty melt which comes with fries and a cup of soup (soup of the day was chicken and rice) washed it down with a can of Diet Pepsi.
It's your typical greasy spoon diner in the City. Good prices and decent food. Probably why its been open for as long as I can remember.