Ottobar is small but is a good place. The staff are nice too and they give out free water. My only complaint is that it is basically in a sketchy neighborhood boarding a more sketchy neighborhood. Went to a gas station and the doors only opened from the inside. Enjoyed the show but spent time between sets wondering if my car was stolen.
It really isn't that bad, I live 2 blocks from the Ottobar literally and it's a pretty nice neighborhood. That's just how Baltimore is. One block is really nice, one block up and one block over is a little sketchy and repeat. During bigger shows they always have at least one member of security patrolling the lot to make sure a) no one is drinking in the car and b) everyones cars are safe.