5.5 Strogoff, 37 blvd Bonne Nouvelle in the 2nd, 01.77.13.47.99 (Metro: Bonne Nouvelle), closed Sundays was chosen not because Michael Strogoff, of Jules Verne fame, worked for Tsar Alexander II of Russia, who dressed in cool royal garb but because it was reachable from the cabinet of my dining partner. It's a simple enough place based on simple enough ideas - tapas, tartares and tartines.
My American expat friend who has lived and worked here forever had the special of the day, a jazzed up tuna tartare (jazzed up by spicy cukes and other good for your health things); I had a ceviche of daurade with also lots of herbs and greens; and we both had their excellent fries (not from Metro for sure) as well as sharing a moelleux of chocolate with ice cream - quite decent indeed.
With 50 cl of a Cote de Cascogne, no bottled water, OK bread and 2 coffees, our bill was 58.10 E. (dB level varied all over the place but max'd at 81.8.)
Go back? Not necessarily, but the wait-people are superb and the prices are right so for some folks staying nearby, it's a light meal possibility.