Holes in the Wall
Interesting question. It seems the definition of "hole in the wall" is dependent upon your perspective. I know when friends come up from DC and we go out, there is ... well ... lets say a disconnect.
Regardless, two places that would seem to fit any definition:
Martick's. Fantastic french restaurant on Mulberry Street. Make a reservation and then knock on the door. There is no door knob, the door must be opened from the inside and its better if they know you are coming.
Fort Charles Pub: A quintessential south Baltimore corner bar with great food. It recently sold, but to my understanding the operations haven't changed hands yet. I'm sure someone will correct me if that is wrong. Go there now before its gone.
FCP is still open. I talked to one of the bartenders and it's apparently been sold to the owners of No Idea/Don't Know, who plan to redecorate and take out the pool tables and sell wine and stuff.
I've been trying to hit at least once a week before it changes, which will probably be near the end of Feb.
Were we going to try to do an FCP sendoff?
I certainly wouldn't consider Peter's Inn a hole in the wall. They are very busy, they don't take reservations, & it's often hard to get a table because it is popular. Captain Larry's in Fed. Hill (they even have drink specials whenever it is raining outside). Also, Tyson's Tavern on Fleet St.