All you need to know is Mos mos is the best coffee shop in the financial district. Don't be fooled by the long lines or sticker system, the staff are friendly and helpful to get people in and out.
My favourite treat is the iced matcha green tea latte. Even a simple coffee is amazing as they steam the milk and top it off with coffee dust.
My small complaint is that the food options are on the pricey side for nothing special. Thankfully the drinks make up for all of this.