We work very closely with our partners to try to improve the data. It's not always easy. I gave a talk about this at csv,conf in Berlin in July, slides are here: http://www.slideshare.net/lokku/a-living-hell-lessons-learne...
"Unless you hate life, do NOT try to scrape real estate data"
With this conclusion, do you mean web scraping or just processing the datafeeds of your partners?