It's nice for drinks maybe but don't ever EAT there, it's a total rip off. One of my worst experiences in London so far with one of the most incompetent stuff - save yourself the time.
PS: And if you complain about them, they'll always say you got caught for stealing. Just go see their facebook reviews. Dear Dalston Jazz Bar terrible owner, you can be sure that if something legal can be done about your false accusation, I'll do it. I'm sick of your arrogance. You really are a BAD person.