We stayed at this apartment with two little ones. It's located off the main road so it's quiet at night and opens into a lovely little courtyard.
We would recommend this place for a couple, but not a family. The neighbors below pound at the slightest sound at any hour which is a challenge with kids and left us stressed. The apartment is sparse, lacking even a sponge to clean your dishes but the host will provide more "amenities" such as this for an additional cost.
Great location close to cafes and public transportation and within reasonable walking distance to the Louvre and Notre Dame.