At the moment the only free dates for the "Beautiful apartment in the Born" listing are in September and there's a 10 night minimum stay so guests can't stay for only a week.
When I try for accommodation for 10 nights the price doesn't have a discount.
Still the web site is buggy and does not know how to multiply the daily rate by 7. Unbelievable that a company worth tens of billions of dollars has a web site with bugs like this. I have seen lots of postings by people complaining about this same problem dating as far back to 2015. Just do a Google search and verify it.