Our family of 7 stayed there for 8 nights and had a wonderful time. The apartment is close to three different metro/train stations; all within walking distance for an 8 year old. The apartment is large, 4 bedrooms give everyone some privacy and a place to rest up and recharge after sightseeing. The view from the front room windows of the Eiffel tower is great (we were lucky enough to be there for the July 14 fireworks). Good sized kitchen (stove, refrigerator, dishwasher, cloths washer/dryer) made it easy to prepare meals and then eat in the dining room. A grocery store almost next door and a bar/restaurant (on the corner to the left) that sells fresh croissant and pain au accolade in the morning. Lots of good small sidewalk cafes along the street. Lots of windows made it well lit, cool, and airy.
A couple of small negatives. Most of the pillows on the beds were pretty old and lumpy (by American standards). The household supplies were a little bit inconsistent. Many basics, like salt, pepper, olive oil, etc., were there (some left from previous renters i think) but some things were missing. Dish towels, but no dish washing cloth. There was dishwasher soap but no laundry soap. Nobody I know travels with laundry soap, so we had to go buy some (and leave it there). Not very many dishes, we ran the dishwasher after every meal. No corkscrew, so bring your Swiss army knife!
Except for the pillows, the negatives were small and easy to overcome; minor start-up problems mostly solved by one trip to the grocery store.
It was a great place. We had a wonderful time there. If you've got 6 or so people in your group you should stay there!