A friend of mine just came back from Ho Chi Minh city and she posted some pictures. One of them is this of the Continental Hotel:
"Built in 1880 and located along Dong Khoi Street, the hotel forms an integral part of the city's history. It counts, among its distinguished guests, the novelist Graham Greene, and the hotel features in his book The Quiet American"
By the association with Graham Greene's The Quiet American, my friend has just made the Continental Hotel in Ho Chi Minh a place I visit before I die!