Europe and US citizens - different preferences regarding the living environment?

Hello, I am PhD student in Prague. I am using the conjoint analysis to simulate the preferences of the city habitants when they are doing the choice of their living environment. I am posting the message because I would like to test the differences between Czech citizens and people from other countries. So far most of respondents are from Czech Republic. I have created the web application that enables you to teach preference model about your preference. Later you can play with your preference model and test your preferences for various scenarios. Everything can be found on web page:
http://gis.cvut.cz/index.php?id=190&lang=en
As you will see, I also tried to project the preferences onto the GIS model of Prague. Later I would like to use the results for analysing the link between the city habitant’s preference formation and the formation of land prices. I will be glad for any new response.