Preheat oven to 375°F (190°C).
In a pot, bring water and butter to a boil.
Add flour and stir until dough forms, then remove from heat.
Beat in eggs, one at a time, until smooth.
Pipe dough onto a baking sheet, forming éclair shapes.
Bake for 20-25 minutes, until golden and puffed.
Let éclairs cool completely.
For the filling, whip heavy cream, coffee, and vanilla extract until stiff peaks form.
Fill the éclairs with the coffee cream using a piping bag.
Dust with powdered sugar and serve.