If you want to feel how is live in Paris, i think you should stay at Sophie's apartment. Located in calm and residencial area. Two subway station in few steps. There are shops for foods for any kind of necessities.
The apartment is really confortable and with all stuffs that you need to cook and relax, after spending several hours walking or visiting museums.
Finally the hostess, Sophie, is a adorable person, who is always ready to help with any doubts about Paris.
I really reccomend spend some time at Sophie's apartment.