A Vietnamese café in the 9th, and the unexpected option for working over a cà phê sữa đá or bo bun. Stable Wi-Fi, outlets within reach, which is enough to validate the address. Décor is no-frills, the food is good and cheap. The only trap: at meal times it's a crowd. Better in late morning or mid-afternoon, when you'll find space to open your laptop and power through your to-do in controlled change-of-scenery mode.
Yes — Hanoï Cà Phê is a café in Paris listed on Deskover as a place to work with a decent WiFi and a nice setting.
Yes, Hanoï Cà Phê has a decent WiFi.