I have noticed that many people have difficulty locating this restaurant ... you need to go right down to the Bolton Street end of the street. The problem is that many people think that this section of the street is a different street.
Many years ago the original Hanoi Hanoi Vietnamese restaurant at 101 Capel Street was by a country mile my favourite restaurant and I visited on a regular basis even though is eventually morphed into a Hong Kong Chinese restaurant.
Soon after a major revamp in 2019 it closed because of Covid-19 restrictions. Recently it reopened has HA NOI - HA NOI and once again it is genuine Vietnamese restaurant and it is excellent but for various reasons I have only been able to visit a few times since the reopening.