It was built in 1890 and renovated in 1950 (see pictures).  

Its address is 12 Hang Luoc street, Kim Ma commune, Hoan Kiem dis., Hanoi.

This masjid has Indian architecture and used mainly by  Muslims from overseas.  The Imams of this masjid are the Afghani-Arabic teachers from Al-Fath Islamic primary school close by.  

Muslims in Hanoi are mainly the Embassy workers from Indonesia, Malaysia, Brunei, India, Pakistan, Egypt, Palestine, Iran, Iraq and so forth.  It is possible that  they make up over 90% of Muslims in Hanoi.  

As for the Vietnamese Muslims themselves, most of them live near the masjid.  There are about 3 Muslim families whose grandfather is a Pakistani, one couple consists of Vietnamese and Bangladeshi, one old revert, one young revert and myself.   At the moment there are about 15 of us.