Yep. I scraped a couple of months of that site to get the initial data, and still collecting the new data everyday to re-train the model once in a while

Not really, but one of the features to model get is whether it is from an agent or a private person, so it may be able to catch that. I don't think I encounter that much on that site though

Thanks. I used mean absolute error. The error was around 80,000 NIS which is equal to 22,000 USD