For bubble tea in The Hague you go to Sisi at Wagenstraat 54 in between Café de Waag and Wenzhou Kapsalon. Besides bubble tea, they also sell easy dishes like poké bowls, bubble waffles, pancakes and sandwiches pulled pork or chicken teriyaki.
Some of their bubble teas: Hong Kong milk tea, green jasmine milk tea, taro milk tea, taro coconut milk, chocolate milk tea, matcha latte and triple dragon. Prices for the bubble teas are fine and range from €3.20 to €4.10.
One drawback is that it always seems to be very crowded, so be prepared for long waits.