They depended on craigslist too much. It worked really well when craigslist wasn't stopping them from using craigslist. craigslist is international. Does craigslist have listings for Cologne, DE, Berlin, or Tel Aviv, IL? If it does, they would have appeared on PadMapper. I've used PadMapper before. I didn't even know they had any other sources; I thought it was strictly a mapping of craigslist listings.
Okay, that explains why it's empty now, but then again it's a strong reason for craigslist to go after them, I guess. If the service is mostly a good search ui for their data..
Regarding listings in the cities I mentioned: I only know that Tel Aviv definitely uses craigslist. I never used it in Germany before, no idea if it is relevant at all in those places.
Craigslist isn't a thing in Israel - there are a few competing sites that share one important attribute which craigslist lacks - an interface in Hebrew
