I have had my eye on this place for a little while now, I had heard good things and its close proximity to several key spots in Paris (including the Eiffel Tower) made it a promising place.
Les Arlots is a tiny, cosy and extremely intimate bistro up at Barbès Rochechouart, reservation is a must, especially if more than two of you will be eating.
When we visited Sagarra, a traditional and large restaurant not far off Barcelona La Rambla, it had plenty of diners but also plenty of empty spaces.
A coldish evening in Barcelona was perhaps not the best time to try ATN, a restaurant just off La Rambla. It was mostly empty and lacked atmosphere.