Hi bro, wish you the best in Hanoi. On the HJ tip amount , it also depends on where you are going to (Generally it can range from 300k to 500K in hanoi ).
Let me share some infos on massage places in hanoi that provide HJ/BJ.
I tried Fortuna Massage place once but swore not to go there again as the girls were mostly "spoilt" nowadays and asking for very high prices and if you dont agree with them, their attitude turned from hot to cold. hahaha.
I had since patronised oasis ( they have 2 outlets in hanoi ,one opposite fortuna and oasis2, the other one nearer to hilton (on the other side of the main road towards the river). For Oasis 2, most girls provide BBBJ nowadays at rates between 600k to 1M ( girl dependant). Those SYT's CFM look girls will ask for 1M.
HJ can be had for 300k to 500k.
Maybe on bad days, they will lower down and also depend how hard you bargain. Which is unlikely as by the time, they asked you , your little bro will take over your rational thinking most of the time.
I read some threads here that says that they got BBJ for 600k, thats a good deal and i will try to bargain to this level at my next trip.
The oasis opposite fortuna hotel operates the same way as oasis2 but i personally find the more solid girls are at oasis2. so if you like to try this place, dont waste time but goto oasis2.
At oasis 2, the reception boss there is mr Thuy and he speaks perfect english. Although the rest doesnt. He can give recommendations but sometimes a hit or miss..hahaha
On the set up, Fortuna massage is a much better set up as being in a 4 star hotel,vs oasis. Oasis set up is pretty run down but acceptable to me as the most important is the quality of the girls.
There are many other massage places in hanoi but by large these 2 are the better ones.
Hope this helps.