Speeder: What characters can give those directions? I even managed to find (by accident) the guild, and yet noone told me where the damn money changer is.
Not really sure. First time I played the original Quest for Glory 2, I was given instructions by Ali Chica once I tried purchasing something from him. He told me that my money wasn't good, and that I should visit the money changer. Asking about money changer had him giving me instructions on where to go.
Reading a bit more, it seems that if you've selected Text Parser or Both for dialogue options you should be able to ask anyone about Money Changer. Alternatively, there should be a map included in the FACS manual that you can find in the game launcher.
If the above fail, try the following:
[spoiler]
Head north on Junub Tarik all the way to the next plaza, the Fountain Plaza. Here, also, you can talk to the merchants, maybe visit the Apothecary and Magic Shop, but where you need to go is west on Naufara Darb (which is the street next to Tashtari the Brass Seller). Follow it until you can go south on Dinar Tarik, then follow Dinar Tarik all the way to the end, avoiding turns into other streets. At the end you'll reach the Money Changer.
[/spoiler]
Once you finally find Dinarzad, it's best to exchange your coins 50 at a time, for a better exchange rate. Hope your travels in Shapeir are interesting :)