If you wish to explore the history of the old Hanoi, this is the place from where you might want to start. What used to be the commercial core of the city with many shops and manufacturers producing the broad variety of goods is now a very popular tourist district. You can admire the architecture of the houses and the specialised streets where the craftsmen would only practice one craft. This was a common practice in this area but some of the specialised streets no longer honour this tradition today. You can also taste the local cuisine here and buy some handmade souvenirs from your travels.
Wikipedia https://en.wikipedia.org/wiki/Old_Quarter,_Hanoi
Address 74 Phố Hàng Bạc, Hàng Bạc 110901, Vietnam
Coordinates 21°2'2.281" N 105°51'7.124" E