I did, and I solved it. I developed a web monitoring tool that checks several times a day real-estate websites to spot houses and apartments available in my hometown at a relatively cheap rent. The notifications are sent to a Telegram public channel. There's not really a one-size-fit-all solution, only custom made ones, which need adjustments whenever the website's layout changes. Plenty of large and small companies can develop (and possibly host) a solution for you.