Best location for Merchants' Guild is ?

[Kobal2fr]

Cabbage question here but why is Stockholm so good at trading.

1) it has umpteen ressources. From the top of my head : 2 iron, 3 furs, 2 amber, 1 silver, and maybe some fish as well
2) Most provinces it trades with also have amber, which is an expensive ressource
3) it's central and borders two seas, meaning it gets to trade with russia, poland, hre, flanders and even england sometimes.
4) the mines are awesome, which makes it a doubly good town
E) it's usually far away from your capital, so merchants trading amber make fortunes.