We (a couple with two young kids from a small New Zealand town on a vacation) stayed at Aurelien's apartment for 4 nights in June. The apartment is relatively large and fully-equipped. Aurelien's is a genuinely nice guy and a great host. He made sure all our needs were catered for and answered our dozen enquires about the city and transport fully and promptly.
The apartment is in the third floor of a building right next to the Pantheon. Luxembourg station and nice park are within walking distance. The station is for both Metro and RER which will make your life much easier if yoir are, like us, not used to trains and subways etc. Thr notre Dame and river bank are also within walking distance or a short taxi ride away.
You will love Paris and Aurelien's apartment and, like us, you'd likely wish you could stay longer! We shall be back!