Getting a newspaper QR code scanned
Size matters more than design. A newspaper is read from about 40 cm, so print the code at least 4 cm wide (roughly one tenth of the reading distance) with a clear white border on every side. Avoid placing it across the fold or in the gutter of a double spread.
Give a reason to scan in words next to the code: "Scan for 20% off this weekend" beats a bare code. Price lists, free site visits, callback requests and limited-period coupons all work, and the reason should match what the landing page delivers.
Use a separate code per edition and per insertion date when you can. If the same ad runs in two editions with one code, you will know the ad worked but not where, which is the decision you actually need to make before the next booking.