When choosing a hostel as an expat of any sort, or even just travelling about, there is no such thing as too much information. Sure you can get all the information you want from the website in terms in reviews on the Hostel itself...but what about its residents? Visit an hostel on https://www.hostelworld.com/ and click on the extension. After a few moments a popup will appear that tells you how many people have reviewed the hostel, what the average age of the reviewers are, the age distribution, the gender distribution and Nationality Distribution. This allows you to make inferences on data and make more informed decisions on where to stay when travelling. It helps to know your neighbors!