This is a unique bar. It is fully dedicated to Gypsy Swing or Manouche Jazz, in other words the guitar style pioneered by Django Reinhardt in the 20s and 30s.
The place has a 30s "belle epoque" parisian style and a good menu mixing french and european cuisine. On Tuesdays there is a free Jam Session with excellent musicians and great atmosphere. Most other days it's free before 8pm except for certain high profile concerts. The place is small so booking is often necessary.