While Map Room, with its extensive beer offerings and beer education, is still a great place to hang out solo or with friends, it isn't ALWAYS a great place to hang out. This mostly occurs on weekends when young twentysomethings, or those pretending to be young twentysomethings, converge at this bar in their chunky square glasses and blazers over layered shirts...you know, the ones who are trying really hard to be different and fit in at the same time. I'm not saying this happens all the time; what I am saying is that there is no predicting.
The bathrooms are small, but generally okay in the cleanliness department.
Map Room also seems to be a good place to meet people, either platonically or romantically.