If you've been touring Koenji's craft-beer bars, and you're still in the mood for a nightcap after the other bars are closed, Shimeji - open until 7am Fridays and Saturdays and 6am on weeknights - is worth knowing about.
The dozens of bottled beers in the fridge include multiple varieties from Scottish brewers Black Isle and Brew Dog, as well as a decent selection of Belgian beers. Bottles are around average in price for Tokyo, but wines and cocktails are relatively cheap, and simple dishes like pastas and jerk chicken offer good value for money.
An old-fashioned pub-style bar, Shimeji is funky and unpretentious, with beer and liquor posters on the walls, a dartboard off in one corner, and a TV showing sporting events. Seating is comfortable and relatively spacious, and bouncy pop music plays in the background.