It's a McDonalds. There's nothing you can say about the food that people don't already know and either love or hate (but still probably secretly crave that guilty pleasure of some nuggets and fries from time-to-time).
What is notable about this location is that A - it's connected to the St. Clair subway station and B - it's 24 hours.
This tiny little location is nothing special. It's very plain; you might mistakenly walk in here when heading to subway station if you weren't paying attention. There is no seating (although there is a bar-height window ledge if you want to stand around the front).
It's quite clean for your typical fast food joint (even a peak behind the counter into the kitchen showed shiny stainless steal and bright white walls) and despite only a couple of people working the graveyard shift my order was delivered very quickly, hot, fresh, and neatly prepared even during a bit of a post-bar-night rush.
Most conveniently and what makes this stand out from your average Mickey D's is the take-out style counter in the streetcar bay, where you can pause in-transit to fuel up.