This is an easy five stars for an Pittsburgh institution that's kept itself relevant.
Service is great. Servers are super friendly and come by at the perfect frequency for coffee refills, etc.
Food is excellent. The menu is very prolific, pretty much every diner breakfast option you can imagine plus burritos, etc. There's a lot of veg on this menu and a lot of avocado which makes me very happy, indeed.
Prices are reasonable. Expect to pay $5 for a regular 2 eggs and toast type breakfast and $7-11 for anything else. Coffee is $2.
OH! The most important little secret about this place: They take reservations. I had a group of 10 friends come into town and we made reservations for saturday morning. It was a blast waltzing in with that many people and skipping past the line that was out the door.