Hanoi's coffee culture

For an article about Hanoi's coffee retailers, see here. There are hundreds of coffee shops in the Vietnam capital, deep in alleyways, on sidewalks, in posh hotels. The article provides pictures of a sample. Curiously, the article says nothing about the coffee itself, only that it is typically drunk with sweet milk and a little sugar. Apparently it is brewed, locally grown coffee. Except perhaps at the fancy hotels, there isn't the variety of espresso-based drinks common elsewhere.