Greg's apartment is definitely in a good location, in between the Champs Elysees and the rue du Faubourg Saint Honore, in a quiet part of the street (as closer to Rue du Faubourg); close to multiple subway and bus options, supermarkets within short walking distance. Perfect for easy reach of many must-see spots in Paris.
The apartment is exactly as shown in the pictures so you will not be disappointed. Kind welcoming by Greg's mother.