Been Viet about 5 times - HCM, da Nan, Hoi An, Mui Ne etc No exp with Hanoi
Try this - find taxi driver, tell requirements.
Wait in room - he delivers, reject if don't like, accept if like - tip him, pay her.
He will keep bringing more and more so just be patient.
PS don't stay in Govt run hotels - usually 3 star & 4 Star are better.
District 1
Prof