In previous trips to Paris, I've stayed in the the Marais and in the 15th arrondissement. Loved both neighborhoods. But I'm being lured by prices that look about half as expensive in the 19th, around the newly opened Philharmonie in the Cite de la Musique. What little I've seen of areas near the Peripherique, through the window of buses, seemed traffic-jammy and workaday, but if the area is on the upswing, and I'm going to be getting on the metro first thing most mornings anyhow, why not consider staying near a stop out where Av. Jean Jaure meets the Peripherique?
Am I not taking something important into account that explains the cheap lodging in this area?
Are there plentiful cafes and bars to keep me well-oiled in the mornings and at night, or would I need to plan on getting on the Metro again after dark?
I'm thinking of London by comparison -- I wouldn't hesitate to stay along the District Line to the west or off the DLR towards Greenwich if the money savings was significant, but I would not stay off the Northern Line no matter how cheap...