Friends and I were staying right around the corner from JJ, plus the craft beer options, made this an inevitable stop!
We actually ended up stopping in for: a) live music, b) an evening starter, or b) a night cap each of our 4 days in Istanbul.
They carry one of the city's best craft beers - made by '3 Kafadar' - including a great nitro stout and a very nice IPA (Mosaic).
Add on some loud, raucous live bands, a warm, convivial atmosphere, and you can see why we enjoyed our visits to 'James Joyce'. There is often a small cover charge for the live bands, but they typically had a free DJ playing chill tunes up top. I hope you do too!