The flat is exactly as described and plenty large enough for a family to relax in.
We enjoyed the two levels and multiple French windows that allowed breezes to come through.
Everything you need is in the flat or within a 5 to 8 minutes walk. Metro stations are within the same distance. And the neighborhoods along the Seine are 15-20 minutes subway ride away.
The check-in was great as was the ease of check-out.