On our way to find yet another banh mi cart, we noticed a tiny sign that said "boo coffee, 9th floor" at what looked like an alleyway full of parked motor bikes. We went in, took a crowded elevator up to the eighth floor (the 9th floor button was deactivated), went up a dark set of decrepit stairs, and found an illuminated Boo Coffee sign. We were totally creeped out, but our uneasiness was relieved when we opened the door and found the adorable coffee shop with an amazing view of the street below. It also served the best Vietnamese coffee we tried on our trip, served in glass skull cups. Their "cotton candy" coffee is popular here, apparently: A glass mug of Vietnamese coffee topped with a comically large puff of cotton candy. If you go, make sure to wind down the stairs of the building—it's full of other indie coffee shops, designers, and jewelers.