We had an absolutely, wonderful weeklong stay at Olivier's place last week. The apartment is beautiful, with large windows, high ceilings, creaky old wood floors (which just adds to its Parisian charm) and is perfectly appointed and clean. It is 1 block from the Chatelet metro stop, and walking distance to many sites. The only downside to the apartment is that there is some construction across the street, which is in its final stages, but this did not diminish our experience in the least. If you are planning a stay in Paris, look no further.
Olivier was a gracious host who met us early on a Sunday and allowed us to drop our bags until the apartment was ready. He oriented us to the apartment, and left a guide book that has many helpful tips, including a local restarurant - Pirouette, where we had our final spectacular meal.
This apartment has everything you could want for a stay in Paris, it is beautifully charming, centrally located, quiet and clean.