I recently got excited by an apartment listing on craigslist Zurich. It was a similar situation, 650CHF a month for a 2BR in Dietikon.
I am still smarting from the realisation that I was almost played by a scam artist. Luckily, my fiancee pointed out how obviously fraudulant the guy was before I sent out any money. She's a keeper.
I guess that when it's too good to be true, it's just too good to be true.