6.0 Sens Unique, 44, rue Damremont in the 18th, 01.42.23.04.63, open 7/7, tapas at 6 PM, brunch Sunday (Metro: ah, no, Bus #95) is a place I've been going to off and on since it opened in 2011, last time in 2013. In 2014, a new chef, Frédéric Lyard, ex-Plaza-Athénée, etc., and digging deeper, apparently Agapé Bis and Damien Dussac, ex-Gagnaire, etc., arrived and the food has moved up a notch.
As an amuse the chef sent out a mascarpone of haddock, mild but not over-smoked as with toasts; then Colette had a tomato gazpacho with whole baby tomatoes that was very tasty and I had croustillant of cod that was juicy like cromesquis, also superior. Then we had as mains, the carpaccio of Serrano ham with sliced melon and strawberries and I had a superb piece of crispy-skinned (beautifully salted) lieu jaune with vegetable noodles. For some reason neither photo came out.
To wind up, Colette had poached cherries with delicious whipped cream and I had a café gourmand with quite decent coffee.
Our bill with tap water, another coffee and a bottle of very drinkable rosé was 71 E.
Go back? Yes, despite it's location in the Bermuda triangle of transportation, it's on a street of gold for food - Gillardeau at Au Bon Port, Delmontel, Lahrer, Virginie, etc. And you can get a bagel and a chuckle too (see advert below from the bagel shop)