We (family of four) had a wonderful time in Paris. Thank Sophie to let us stay in your lovely apartment.
Sophie’s apartment was the right choice for us; it is just 2 minutes walk from Pigalle metro station (from this station you can get on to M2 or M12 line and get to all major points of interest in Paris), and about 5 minutes walk to the famous Moulin Rouge (this was very nice for us as we booked an 11pm show at Moulin Rouge). The area was quite safe at night, so it was very pleasant walking down the street (which we really really enjoyed). There are few minimarts and supermarket nearby within 2 – 5 minute walk, with a couple of them open until midnight, so you can get most of the stuffs you need. For those who like to go to pub & bar, there are plenty of decent bars nearby, these places are also opened during the day serving breakfast, lunch & dinner, so you can enjoy the local food anytime of the day.
The apartment is equipped with most of the stuffs that you need, from kitchen (stove, oven, fridge, cups, plates, etc.), living room (TV, DVD, sofa, even a Mac if you need to, Sophie has a collection of nice music as well), to bedroom. My children love the bunk bed, the toys and the piano.
Sophie is very nice, though we got to Paris quite late she made sure that she welcomes us personally and showed us around the apartment, she even brought us some food for the next day breakfast, which was nice. On the last day we got to leave very early, Sophie offered help to arrange for a taxi, which is really important as we couldn't do so with our limited French.
Few notes from my personal experience:
-If you plan to visit few museums (about 3 or more), as well as getting around Paris (by metro) then it is worth getting Paris Pass (http://www.parispass.com/). You can order from the website and collect the passes when you are in Paris. It is about 25 minutes walk from Sophie’s apartment to where we can collect the pass, and this is a very nice walk as you will pass by many nice streets and interesting shops along the way.
-If you book a taxi, they are quite punctual so you should be downstairs on-time, as they start the meter and charging from the first minute they wait for you.