I found this place and have been going regularly lately, so I thought I would post a raving message in support of a cool bar.
The bar is behind the Ming Yao dept store on Zhongxiao E Rd. Sect 4 (MRT Zhongxiao Dunhua Station Exit 3), get out of MRT, turn right and go south down the first lane (Lane 170), when you reach Alley 17 turn right (west) and it is right there.
Food is a modern variation on Thai cuisine, and it is well prepared and reasonably priced, NT$200-$3000. Most alcohol is premium brands, even the well drinks are better quality, and the bar tenders are very skilled. The staff is a little shy speaking English at the beginning but they warm up quickly and are very friendly. Locals (which is most of the customers) are friendly and quick in making conversations. They have nice seating for dinner, even semi-private rooms where few friends can be isolated from the bar noise
if you come by feel free to say hi, I am usually the only foreigner sitting at the bar.
website if you read chinese:
mangotango-taipei.blogspot.com/
some photos:
wiselyview.net/blog/read-1258.html
disclaimer / small print:
no business association other than being a happy customer