Barista jam is a nice concrete Soho/Mission District style coffee place. Tucked in a alley in Sheung Wan, it serves good coffee in a quiet setting. There is a upstairs area. and a common table and some smaller tables downstairs.
The Barristers are not the most friendly. But I think it is the set up where you sit and you are served your coffee. So in that sense, it is missing that crucial interaction.
They have put HK service into a specialty coffee house that deserves more interaction because their coffee is quite good.