Stir espresso powder with hot water until dissolved. Let cool for a minute.
Chill a mixing bowl and whisk for 10 minutes for quicker peaks.
Pour cold cream into the chilled bowl. Whip on medium to soft peaks.
Add sugar, vanilla, and salt. Beat in the coffee mixture to medium peaks.
Stop before it looks stiff and dry. Taste and adjust sweetness if needed.
Serve right away or chill, covered, until needed.