I just came back from 4 wonderful days in Paris.
Nathalie's flat is great - it's very well located (15 minutes walk from Pompidou, The Louvre and many other places), close to many restaurants, bars, patisseries, subways, etc, and we walked almost everywhere.
The apartment is great for 1-2 people - very elegant, clean and cozy.
There's also wifi and a small kitchen (which for some reason weren't listed on AirBNB), so we were pleasantly surprised.

Nathalie was very nice and accommodating, leaving maps and recommendations for places nearby.

You should note, however, that like many apartments in Paris, the apartment is on the 4th floor without an elevator. We didn't mind, but some people might.