I visited this location of B&P once over inauguration weekend. It was busy (a 35 minute wait), but the brunch menu offers some great selections. My husband and I are both vegan, and there are good vegan options always available.
He had the wheatberry and spinach salad, with a side of tempeh bacon. The salad was a great contrast of flavors and textures, and the bacon was nice and smokey. I tried the tempeh panini with fruit on the side. The sandwich was tasty and the fruit was fresh.
The environment here is great, and they seem to be able to handle big groups as well as just a couple people. The menu has a vegetarian and vegan selections, but is mostly meat, so this would be a good restaurant for a group where everyone will want something different.
We went back the next day, as we wanted to try something off the dinner menu, and the wait was about 90 minutes! I called the other 5th Street location, and they noted they only had a 30 minute wait. Something to keep in mind if you are hungry and/or don't want to hang out in the bookstore for a long time.
Cons: can be a long wait, staff seemed very stressed