Literally directly beside the Bataclan which was a bit strange to think about but it's a safe neighbourhood. Not too much nightlife on streets directly surrounding unit but fair amount of traffic noise on Boulevard Voltaire.
Fairly central location - 5 mins or less to Republique. 10 mins to heart of the Marais (Marche des Enfants Rouge etc.). 25-30 mins to Les Halles, Notre Dame, Latin Quarter. Times can be cut down by using Velib (bike station right across the street from Emilie's place) or metro from Oberkampf (3 mins) or Republique (5 mins).
Unit was clean, had access to pretty much anything I needed with good wifi connection.
Only thing was that i kept getting bug bites every night. I don't think they were bed bugs, they were probably just mosquitoes. But damn, did they itch!
All in all, good value for the price. Next time I might try and stay closer to the city centre or somewhere on the left bank though! But places like this are more expensive, so that's something to consider.