A .org website just means that it’s a nonprofit, nongovernment, noneducational institution – it says nothing about whether the site is reliable. Freedom House is generally considered to be a reliable organization. It would be better if you could find printed material that they distribute with the same information as is on their website. Websites change from time to time, so it’s not the best format for making sure people can double-check on your references. The problem with using Wikipedia as an authoritative source is that there’s no quality control, since anyone can go change it.