I did a lot of homework prior to going to Hanoi last week, and lo and behind I did find a FJ shop.
The shop name is D Salon and is apparently run by a Korean boss in an area with a lot of Korean restaurants. Contact the customer service via TG. (Google for D Salon Hanoi and the TG link is ranked fairly high up.)
Took Course B which is massage+ Nuru +BBBJ + FJ for 1.8m VND and picked
#9 because I wanted natural boobs specifically and she was the only one with a B cup. The others were either A (too small) or C(not working that day). There are about 8 to 10 girls to pick from.
Girl came in and massages you first, before proceeding with a bath and then you'll go back on the bed for Nuru and the rest. Shan't elaborate too much because quite SOP.
Looks 6.5/10 (looks about mid 20s, face is acceptable. Above average compared to SG girls)
Body 6.5/10 (a little chubby but overall still ok, boobs turn out to be closer to a C so I guess it's natural that she's a little meatier since Viets aren't known to be busty)
GFE 7/10 (would have been higher if we had no language barrier but can tell she was trying)
Massage 7/10 (not a professional masseuse of course but does her best, non-piano rendition)
BBBJ 6.5/10
FJ 7/10
Overall still worth visiting considering it is cheaper than the BBBJ spas