The VIEW! From every window you see the Eiffel Tower! It is magical! The flat is modern, clean and just what you need for a home base while traveling around Paris. There is a little grocery around the corner, as well as places to get breakfast/coffee/cappuccino. There is even a Starbucks around the corner if you prefer.
We were out and about early in the morning and sometimes late at night and we never felt unsafe in this neighborhood.
A note about getting from and to the airport: We took the subway from the airport with our luggage (the RER-B line from airport to St. Michel/Norte Dame stop and then change to the RER-C line toward Versailles). The instructions Joss gave were clear and easy. Joss recommended we take the Invalides stop on the RER-C line and walk to the apartment. After spending a few days there, we recommend taking the Pont De L'Alma stop on the RER-C line (one more stop) because the sidewalks to and from the apartment are easier to manage dragging suitcases. The only problem is a large staircase to carry luggage up/down into the Pont De L'Alma station. Invalides has a ramp, so consider that.
Joss and his friend Andrea were helpful with instructions and messaging. We would definitely stay here again!