Housing can actually be fairly affordable in Europe. Berlin until about 5 years ago had incredibly affordable housing for such a nice city…then it simply got more popular until that wasn’t the case anymore. Tokyo would have similar problems if its population wasn’t actually shrinking now (as are Nagoya and Osaka), since it’s a nice place to live, and housing isn’t very restricted beyond having to rebuild everything every 30 (SFH) to 50 (apartments) years.