The Bovine is pretty small and cramped. If you like elbow room you may have issues with this place.
They have live bands at least a few times a week, often for free. And even when it's not free it's usually pretty cheap. If I'm in the area late at night I like popping in for 10 mins to see what's going on.
The stage is right near the front as you walk in. Also, the stage isn't that high off the ground and the floor isn't graded so if you're short you might have problems seeing the front.
The acoustics are pretty good which is always a plus.
It's not the best laid-out bar for music but that doesn't stop me from coming back to see the bands.