I've been to Prague a number of times so I knew exactly where Café Flirt Bar was located in the…read morecenter of Old Town. Yes, it's close by a gay sauna, but that's not what I meant haha. The venue is directly across from Kostel Statého Martina ve zdi, Church of St Martin in the Wall, a beautiful little church converted into a concert venue and art gallery. Look for that on a map.
Café Flirt Bar is a contemporary looking place with two rooms with tables and chairs. It looks more like a café than bar. We went during a quiet weeknight. The handsome bartenders were friendly, and there was a steady stream of mostly locals mixed with a few tourists coming and going.
Unfortunately, there is not much ventilation and the second-hand smoke was overpowering. We've forgotten how bad bars used to be! Czech Republic is one of the few countries I've traveled to that still allow smoking indoors. We left after one drink.
While the bar may seen small, it could be opened up on the weekends where the downstairs cellar is huge! It doubles the size, with another full bar, DJ, loud speakers and more seating.