It is a pretty normal bar where you can come with friends for one or two drinks (doesn't matter, coffee, beer or a long). Prices are a bit higher than in places like Canudos or Dive, but the concept is also different.
Acid is a definitely nice place, not one of those vintage or superfancy ones. Simple design, some books around, music is not loud and hunting, as it happens sometimes in the bars, so you can just take your time and have a talk.
There are also Acid Bars on A. Kazbegi 3 and Abashidze 59.