Since my husband and I moved to Coraopolis we stumbled upon Tootsie's Diner and fell in love with the style and menu. Not to mention the people that work there- they are awesome! We've at this point become regulars on Saturday (or Sunday if my work schedule changes).
Depending on what time you go the pace definitely picks up and gets busy but it's worth it for a nice hot meal. I recommend if you're in the area plan to stop there and grab a bite! Say hello to Tracey our favorite waitress while you're there too!
Oh and last but not least -- Look for their "After Hours" nights. A lot of the photos I've included was from their special dinner experience that they do every-so-often. It's BYOB and a smaller menu but there's choices of apps, main dish, and dessert. Mmm mmm!