OOps! Sorry, I didn't read your post before remotion, Bamsa. So, I've submitted it back to translation into Turkish, and set it in stand-by, until Heidrun or Salvo reply.
"Mainzelmännchen" is a nice word-creation, but I suppose it should mean "Heinzelmännchen". To make it a full sentence, I'd add "Es gibt Heinzelmännchen in Istanbul." ("There are..."