I respect the fact that it's virtually unadvertised. I live in the area and never noticed that red door until meeting friends for drinks there around 10:30 last Friday night.
We were the last 4 people to get in before a line began to form outside, but it never felt too cramped or crowded. Our bill was huge, but we had a great time.
Went on a tuesday after work and found the Negroni wasn't quite as delicious as the first time, and found the atmosphere a bit dark for 7pm, but It's a rad spot.