We had a great stay in Paris. Natsumi was a great host- she shared several helpful emails before we even arrived in France. The apartment was easy to find. It is close to the metro and bus lines and also close to a grocery store.
There were 6 of us together- me, my wife and 4 children (ages 21-25). The apartment was great for 2, ok for 4 people but not so good for 6 adults- it was a bit small for 6 adults. It might be ok if your children were smaller.
Overall it was very clean and had a nice kitchen also. We had a great time and would return again with Natsumi.