You had posted a few weeks ago about the new hotel regulations in Spain. For us it’s not much different because we always had to show our passports. Now though hotels also make you sign a form, some ask for email or phone. Apartment rentals usually have an on-line form to complete including attaching a passport picture, and email or phone. Most are pretty simple and only take a minute. Even the remote check in apartments have them and are very easy. It’s also new to them so they usually ask as soon as you book to make sure it gets done.