So much has been written about Durant's.
Old School Vibe: Check
GREAT Steaks: Check
I'll try to add a few less traveled points:
Yes, the can do child friendly fare. Just ask, and the waiter will give you some choices not seen on the menu.
I don't know what they put in the martinis at Durants, but nothing else compares.
Most places are so keyed into "turning" the room at a good clip to maximize cashflow, they've missed the ability to host a slow paced dining experience ( say a special occasion). Durant's knows how to create a memorable dining experience at a relaxed pace.
The wait staff will be as "stuffy" or as "relaxed" as you let them be. They key off your personality, but always within the parameters of Durant's culture.
The creme brulee is worth it alone...but have the Prime rib too. The horseradish is exceptional.
This is a "once or twice a year" evening for my wife and I, but Durant's is always top notch.