Have your document pack ready before you view — ID, tax number, proof of income, deposit. Landlords here pick the person who can sign today. The Housing section lists the usual document set; check it, what's asked shifted since I arrived.
When I moved to Lisbon I massively underestimated how fast rentals go. I lost two flats because I didn't have paperwork ready to sign on the spot. Is it this intense everywhere, and how do you get ahead of it?