The vast majority of people in the UK, for example, have long commutes by train. I have workmates that have 2.5 hours of commute each way, and while that is extreme, 45m to an hour is completely normal.
Translate that to Spain and your radius for an available house is immense.
There are 266 municipalities around Valencia, each municipality with several (some dozens) of towns, that you can reach by car in less than 60 minutes. In Madrid, there are 179 municipalities less than 60m away from the city.
Again, it would be fantastic if you could walk to work. But that is a massive privilege in large cities.
Correct me if I'm wrong, but I believe that the social organisation of Italy won't be massively different, i.e, lots of small towns around a major city.
I still stand by my point. The housing crisis has nothing to do with immigration, and everything to do with rich people and corporations being allowed to speculate with a basic good.
Paraphrasing Gary Stevenson, if you allow wealth accumulation past a certain level where the wealth cannot be spent in normal things, the uberrich will start buying ALL the space. And that is exactly what we are living now.