I stayed at Lauren's place for two weeks. It is very close to the Les Halles and Sentier area and you can walk to many places (Pompidou, Louvre, Pont Neuf, to name a few). It is in the middle of the Montogueil street and there are tons of restaurants, shops and people (which made me feel very safe) and still VERY quiet. The apartment is small but large enough for a couple. Laurent greeted me in person and kindly showed me around the place. I would stay at his place again.