We booked into the classic room...it was horrible!
We had a cockroach in our bathroom, the bed was as hard as the floor, our room (the whole 4th floor) smelt like sewage as it was coming out of the bathroom drains. They had tried to disguise the smell with a air freshener but it did nothing. When you took a shower it leaked all over the bathroom floor, so you were walking around in a puddle the whole time. There is no natural light in any of the rooms- because there are two buildings on either side of the hotel, unless you stay in a front facing room, there are no windows.
The room was ridiculously small, we could only get on to the bed from one side, there's no space to put your luggage.
There is also construction on next door building a new hotel, and they work crazy hours, so don't expect to get any sleep.
After our first night we did chat to the hotel manager and he up graded us to a slightly larger room, otherwise we were ready to walk out and go to another hotel.
We booked into a few tour through the hotel, MUCH more expensive than what you could get outside the hotel. Do not book tours through the hotel.
Breakfast buffet was always empty, even at 7am. There was no breakfast really, so we ended having to get it outside all mornings.
I wouldn't risk it, you really do get what you pay for. This is the capital of Vietnam, there are thousands of hotels here. Find another hotel and don't let this place ruin your holiday.