Oberkampf is a pretty hip area with lots of great coffee shops (check out Cafe Oberkampf for all of your 3rd-wave, flat white hipster coffee needs)
Nathalie's place was great. Super stylish and cozy. The heat works well and the windows are thick enough to keep out noise from the streets. Any other reviews complaining about noise are likely from older folks who aren't looking to be in the action as we were.
As other reviewers have stated, the modern looking bathroom has a flaw in that the shower glass doesn't extend far enough to keep water from splashing everywhere. (Hopefully a small renovation will fix that!) But altogether as far as bathrooms go in Europe, this was quite nice.
More than anything, Nathalie was great at communicating and the flat allows you to feel at home while not infringing on someone else's home.