We stayed in May 2011, and really enjoyed staying at Frederic's place. It was in a great location and very convenient to the tourist attractions, as well as to the Metro. It was in the heart of Marais, but it was a quiet apartment.

Frederic was a great host, showing us around the apartment with his boys' toys (projector, PS3, Ipod accessories) before we settled in.

Would recommend a stay to anyone in Paris!