The vibe here is very, let's brunch on a Sunday, and not so much, let's study. This isn't necessarily a bad thing and I did enjoy the dirty chai latte, but it wasn't particularly worth the 5€. Mostly that is because the chai and espresso wasn't as strong as I normally like them to be which made the drink taste like lightly spiced and blended warm milk.
Like most cafés in Paris Oberkampf is small, there are four tables and four stools in front of the windows. I suspect that I came at the lunch rush and is not typically this packed. But one did get the feeling that you ought to be eating with friends rather than reading.
Overall, with the plethora of hipster/indie-ish coffee shops in Paris, I'm not sure I'd go back to Oberkampf solely for the coffee or to study/read. Especially when in this general area there is Folks & Sparrows, Strada, and Boots.
+ CB accepted