One big problem was that there are only 2 elevators, and one of them was being repaired the whole time, so I spent quite a bit of time waiting for the lift. Going between my room on the 10th floor and the swimming pool right above could be very frustrating because there didn't seem to be stairs as an option. *Note - be careful that the tiles around the pool are incredibly slippery - they should put some rubber strips on the tiles around the pool.. I nearly fell twice.
The breakfast buffet is not 4-star, but the eggs and pho made upon request made up for it.
I also didn't expect to see a rat running through the lobby,.
One other very convenient point was that the Tour Service desk manager, Ms. Lan, was very helpful. We were able to rent a motorbike (Honda Airblade) with her help for 250k per day. You can rent the same bike outside for about 160 or 180k, but it is much more convenient to do it through the hotel.