Pretty much like all other O&B restaurants, Biff's is upscale with a classy vibe. Central location right across from Union Station. Dim lighting sets a romantic ambiance but it didn't feel intimate since the tables are so close together (at least the ones along the far left wall were).
We swung by after work for some dollar oysters (which starts after 5pm Tuesdays & Saturdays) and frankly, I was a little disappointed. They're tiny and some of them weren't even full oysters. I've definitely had better (i.e.: Nome Izakaya, Wilcox Gastropub to name a few).
Our server was friendly but maybe checked up on us one too many times.
I'll probably give this place another go in the future but until then, my impression of Biff's remains as overhyped.