Easy, discount codes, good filter.
As a professional in user experience, the content is good but the interface could use freshening :) all in all a great experience!
It is the best site accommodating all the needs from all the information about the propertys amenities so thorough and the ease of getting a much needed signed contract for my residency visa. I haven't done that yet but the fact you offer it is immeasurable.
I got a list from from an expat site and yours was the second one I tried I liked your name.