A dingy bar with shady connections owned by Astava, an older demon who used to trick mortals into deals.
After Sunset tends to be a front that does make a decent bit of money on its own, just because it does require infernals to pay for drinks. the drinks are imported from the hells.
They also rely on bending rules in their favor usually, especially when it comes to their smaller businesses (a mall-level augmentation shop, a tattoo and piercing parlor and a furniture store near corpo plaza that's their most profitable 'normal' business).
There's a mild code of conduct, like leaving civilians out of conflicts if possible, avoid attracting the attention of Nakarta's cops (especially Adam deLuca aka Fox), and avoid using magic that's obvious or identifiable.
They also generally wear suits, or aim to most of the time. Dau wears slacks, a suit shirt, vest and tie while working and can often be found dressed like that off the clock.