I have had the good luck of being to Museum Tavern many (10+) times; most recently it was with group of 13 friends for a holiday dinner.
This place is super consistent & always on point. Everything I've tried on the menu is delicious, but my favourite thing to order is their Hearts of Romaine (Caesar salad with about a pound of Parmesan on top) with a side of frites (served with homemade mayo). Steak & fries are also delicious, and my husband just loves the Buttermilk fried chicken sandwich. I'll be back on Tuesday & may order the Maple Ribs (one of the only items I have not tried). Bar & cocktails are definitely creative - wine list is also very good.
Atmosphere can't be beat, sort of old-timey, full of character and warmth - it has a bit of an authentic brasserie ambiance, and it's effect is just lovely.
Staff, and what I can only assume is the super efficient manager/owner, are always pleasant but not cloyingly so. Summertime patio overlooks Bloor st, Philosophers Walk & the ROM.
A sure bet, for casual ($15) lunch, or a dinner to impress.
I recommend reservations for dinner.
Enjoy!