Place the coffee and boiling water in a heat-proof bowl. Stir to combine then add cold water. Set the bowl aside.
Using your electric mixer, beat the cream cheese, heavy cream, and sugar until fluffy.
In a 1 1/2 to 2-quart glass bowl (7 or 8-inch diameter), spread 2 tablespoons of the cheese mixture on the bottom.
Dip 1/3 of the ladyfingers (one at a time and very quickly) in the espresso mixture and place them single file on top of the cheese.
Then place 1/3 of the remaining cheese mixture on top of the ladyfingers and smooth.
Using a vegetable peeler, shave chocolate on top the cheese.
Repeat each layer two more times, finishing with cheese mixture and shaved chocolate.
When you serve the tiramisú, dust it with the unsweetened cocoa powder.