The oldest & largest market in Hanoi. You can find many cheap things and alots of local products on 3 wide floors, 9000m2 each.
This local 3 floored indoor market is well-known for second-hand (used) cloths, shoes, bags. Do not forget to try your bargant tallent here :)
This is Trang Tien Plaza. Located just across from Hoan Kiem Lake (on the south eastern corner), it's one of the more 'flashy' shopping places in Hanoi.