I stayed at Sofia's apartment just recently, Sep 5 through 12. Her place is about 5 minute walk to Charles de Gaulle – Étoile. Many good restaurants, bars and coffee shops in the neighborhood. Her place is a small and clean studio. She's very responsive to emails and helpful. The apartment is on the 3rd floor so you may want to be a little conservative with the size and number of bags. I enjoyed my stay and hope you do the same!