First this place is right in the heart of the San Telmo market on Defensa. Couldn't ask for a better location really, especially during the Sunday market. Its bright and airy and very clean. It's also very popular so tends to be crowded. Unless you go on an "off" time you should make a reservation. It could also be considered a little touristy and it does have pictures on the walls of celebrities who have dined there with their signatures (Tommy Lee Jones was directly over my shoulder).
All that said, it is nice break from locations that are very meat heavy. It does try to be a little French leaning - and succeeds somewhat, at least as best you can in BA. For a local the prices may be a bit high, but for a tourist they were very reasonable. We had two of their more expensive entrees with a bottle of grand reserve Malbec (which would have been over 100 dollars in the states) and the total bill for 2 including tip was about $80 US. For what we got and the price point including wine I thought it was outstanding. It wasn't the best place we ate in BA, but it was for sure worth a visit and we would go again.