I think the main advantage is the location of the studio and Karim's fast response.
The studio is good to see the tourist attractions. The public transportation is not far and you can walk to Eiffel Tower if you enjoy walking.
The nearest station is Passy. It takes 5-10 minutes by foot from the station.
Karim is kind and fast to response when you have a problem or request.
But, because the size of the room is not big, it is not suitable for travelers who want large space.