@Rudi **********
you can register your condo online in the TM30 system, before you can add yourself as the "guest". For the initial registration, you need the blue housebook number of the condo. You would maybe do your first TM30 in person on Immigration, however after having registered your condo, you get a Login-ID and a password, you can from then on report your arrival at the condo as the "guest" online. It would be good if you ask the Immigration if they want you to report your arrival each time you come from abroad, even if you arrive at the same adress as before