Timothy M.
Yelp
If you want a good New-York-style coffee experience, this is one of the best places for it in Paris.
Facilities: Spacious, friendly, hipster/classy (yes that's possible), and generally, exactly how a coffee shop should be. Variety of seating options. Free water (yaassss). Amazing bathroom (always a priority).
Wifi: Fast and consistent. I spent a couple of hours here on each of two different days, at different times, and never had a problem. That's extremely rare here!
Staff: Brilliant. Very friendly. The one who served me is flawlessly fluent in both French and English (from England but has spent much of his life in Paris). Charismatic and genuinely caring, unlike so many other baristas you'll meet in Paris.
Coffee: Good. Not exceptional. But the prices are decent, the quality was up to my tastes, and they do all the standard Paris options (espresso, cafe creme (latte), allongé), as well as some unlisted items.
If I were staying near Belleville I would unquestionably make this my daily spot.