This is a nice apartment in a very nice area. The host was quick to respond to any question, and the check-in instructions were very helpful and to the point. The apartment might be a bit small for six persons (we were four), and as there are several popular outdoor cafes just outside, it doesn't really get quiet outside before well past midnight. There's little traffic though.
We got there from Charles du Gaulle Airport by means of the RER train to Luxembourg station and walked to the apartment in 10 minutes.