sibbl/wohnung-scraper ? reverse-engineered prompt

Build me a web app that pulls German apartment listings from a few major sites like Immobilienscout24 and Kleinanzeigen, then shows all the offers on an interactive map.

I want each place to be easy to understand at a glance, with better deals looking more green and expensive ones looking more red, and the shape and size of each marker should help show how many rooms it has and how big it is. Add filters for the important things people care about, like price, size, and other basic details, and let me save favorites so I can keep track of the good ones.

It should keep checking for new listings and updates in the background, hide old ones that are gone, and send Telegram alerts when something matches the default filters. Also include useful map layers like public transport and other neighborhood info, plus a way to see how far I can get in a certain amount of time by transit from a selected place. If you need current docs for any mapping or scraping details, look them up online.