This location is very nice for seeing Paris as a local might see it. Except for the Catacombs, there is not much to draw tourists, so you mingle with locals and experience restaurants, markets and parks (especially Parc Montsouris) more authentically Parisian. The RER makes travel to CDG super easy, and two other metro lines are very close as well to whisk you just about anywhere.
The view from the terrace and all the windows bring in the outdoors, and are not common in many accommodations in Paris, so this is a plus. The washer and dryer are handy. The bathroom is large by local standards and the bed is very comfortable. We spent the entire week without any problems or complaints.