I went to Hanoi last March ,22 - 25 and found one of the hotel operators (Darling Hotel/Asia Queen Hotel/Lucky Queen Hotel - they are a chain of hotels who switch customers from one hotel to another depending on room availability) not very honest.
I booked a hotel room via travellerspoint with Lucky Queen Hotel at the price published on the website and paid deposit. However, the hotel manager came back with an email saying that they have increased price and I will not get the price on the website. I disagreed with the hotel manager and wrote back an email to him but I did not receive any email from him after that.
As we arrived there, the hotel manager insisted on the increased price (of USD5/room) because, according to him, they have insufficient room! On top of that, we will only get one of the highest floors (there's no lift in most of the 2-3 star hotels and there are 5 to 6 floors). If we need a room on the 1st floor, an additional USD5/room is required.
This is a very dishonest way of doing business. They should not increase price after booking is made in the first place! Not having sufficient room is not an excuse for the price increase because prior to the booking this has been checked already! On the other hand, if lower floors require additional charge, they should at least state that on the website!
I advise travellers to be careful with Vietnam (Hanoi) hotel operators and try to avoid the hotels I mentioned above, in order to stay away from the unhappy incidence I experienced.