We had a wonderful stay in Gregoire's flat. It is located in the upper 9th arrondissement, in-between rue des Martyrs, Saint Georges and Pigalle, a perfect spot to enjoy French delicacies, have a lazy coffee or visit the Montmartre area. The street is sheltered from tourists and offers two great lunch dinner spots (Maison-mere and Amour).
The flat itself is decorated with taste, spacious and practical. The kitchen is superbly equipped and the balcony is a unique luxury in Paris.
Gregoire was not there to welcome us but the superintendent did a great job in showing us around. Nevertheless, Gregoire was very responsive via email.
Overall a perfect place for a stay in Paris.