The Artist Formerly Known as chiggins.
Joe Beef is booked for the first half of my trip and closed for the second half.
What I enjoy, even more than Joe Beef is one of their sister restaurants next door -- Vin Papillon.
Incredible unique food, prepared by the same Joe Beef Chef at half the price. Plus one of the most forward thinking wine lists on the continent.
The best part -- there are no resos! The place is open from 3PM from Tues-Sat. I usually head there around 4:30/5 and snag a table in their backyard patio. I start drinking some wine (the staff is very knowledgeable) and order small plates until I'm full. Their smoked carrot brisket sandwich and their homemade sliced ham are ridiculous.
As for other places, the Eater list is a pretty good recent overview. I'm not sure what hood you are staying in but I always recommend Mile End area. I like to be very close to Larrys so I can enjoy their excellent coffee/breakfast items when I wake up...and their midnight spaghetti