I went to a place called Cafe Obscura or Oscura or something in Sangenchaya.
I've had outstanding espresso drink elsewhere in Sangenjaya (can't remember where), but it wasn't this place.
This place is rated highly, that's why I decide to check it out. They have a lady sitting facing customers making coffee like it's science experiment by brewing coffee in round flasks. They roast their own coffee, and it's clear they take their coffee very seriously here. The coffee was a bit on the bitter/sour side for me, though. If you like bitter coffee, you might like this place.