It's a teeny tiny bar with just a few seats. I've been there a few times but also had to go and look for another bar because this one was already full. It's quite popular among the locals. Very nice atmosphere.
It's very central and due to it's "tinyness" it has a very intimate atmosphere - in the best sense! It's better coming in small groups. Bigger groups have no chance because the place has not so many seats. 6 people might be too much. 4 might be still ok.
if possible make a reservation.