This place is wonderful and besides going a few times a year, we always go to the Harbord Room for my girlfriend's birthday every December.
Make sure you do not confuse this place with the Harbord House across the street and just down the block. Not to knock the Harbord House, but it does not have anything on the Harbord Room.
The place can be very busy and require reservations well in advance. Due to the size of the place you might have trouble fitting more than five or six people at a table. And they always have great playlists going.
This is a place where you are safe to order just about anything on the menu and be satisfied.
The burger, of all things, is particularly delicious and you cannot go wrong with the desserts. They generally have three desserts, all of which are good and they change them up from time to time. I am generally partial to whatever dessert they are making that include valrhona chocolate whether it be the donuts that you dip in the chocolate or the peanut butter, raspberry chocolate cake which was one of my favourites of all time.