How do I renew my apartment application? How long is the application valid?

When you apply for a SATOhome, your application stays valid until the last apartment in it has been rented or if you have rented a SATOhome before that.

In other words: You can keep your application active by adding new homes to it if the previous ones have for some reason not been of interest to you or if they have been rented to another home seeker.