I was directed to this hotel when my first choice was full.
The rooms are fine. The A/C sometimes stopped for unknown reasons but only when the rooms were cool. Free wifi was available but sometimes rather slow. The shower in my room was located so that it was hard to avoid it wetting the bathroom floor. The hot water also ran out during my first shower so from then on I conserved my hot water. Contrary to another review, there is an elevator in this hotel.
One negative was the phone charges. They first wanted to charge me VND 140,000 for a few local cellphone calls. After I questioned it, they mysteriously managed to come up with a lower charge, about half as much. Since it wasn't much money, I paid. Here I believe I was overcharged.
The breakfast was good. The service was very attentive overall with a number of hotel staff eager to offer good service. But USD 40 may be a tad overpriced for this level in Hanoi. The hotel is located on Hang Bac which is in the middle of the Old Quarter. It is very convenient for late night eating for example.