My experience is very different.
I used the coins to play cards in the bar. You get something there that you can use withe the leprechaun. That answers you other question. You get the coins back so you can give them to the woman. When you read the book, it tells you the hint that you need to speak the name of the man who lives in the old castle.
The rag I presume is used to either wipe something or impregnate with oil and become a torch. But logic is not always the best answer in some games.
I have finally found some food, so this is good.
I am now at the drawbridge and don't know the owner's name.
The maze is very long. You need to have several objects with you to map it, and then go and retrieve them to use in further mapping. Basically you need to go in a clockwise direction, starting with west. But you already have found the woman, so you don't need directions.
So how did you get into the castle?
At the leprechaun you need to play the pipes. These are obtained if you play cards.
What did you do at the caves to get the other hint?
No, I don't think I found the hint about the maze. Where is it?
Don't know what the use is of putting the broken glass inside the bag.
I just used it to map the maze. I didn't put in in the bag. What words did you use to put something in the bag?
Do you know what to do with the barman?
I haven't found a lever or soap. So you are ahead of me.