Rob,
Once coming to Hanoi, you should visit some of the must-see places as:the Temple of Literature, Tran Quoc Pagoda, Ho Chi Minh President Palace, The Museum of Ethnology and Hoan Kiem lake. I suggest you stay in mid-range hotels in the old quarter: Thang Long opera hotel, Hong Ngoc hotel, Bao Khanh hotel...
I hope you find this information helpful and wish you nice days in our country.
You can contact me at my Y!M: duc_nguyen1211 for more details that I can help.