Immoweb Deal Finder: Gemini + Sheets + Slack (n8n)

Immoweb Deal Finder automatically labels property listings—BUY, MAYBE, or AVOID—using Gemini, tracked price history in Google Sheets, and real-time Slack alerts

If you monitor Immoweb for underpriced offers, this n8n workflow helps you scan daily or on demand, compare new listings against historical prices, and immediately surface the best opportunities in Slack.

What this workflow does

• Runs on a schedule or manually (configured to run daily at 7:00, or start on demand) to begin a fresh Immoweb scan with predefined search and notification settings.
• Scrapes Immoweb via Apify by calling the Immoweb scraper API and fetching up to your configured maximum number of listings.
• Warns you if scraping fails by sending a Slack warning when the Apify scrape doesn’t return results.
• Loads and deduplicates price history from Google Sheets, combines it with the fresh scrape, and tracks changes over time.
• Calculates market signals such as €/m², comparable medians, discounts, and anomaly flags based on your stored data.
• Judges each listing with Google Gemini using a structured rubric to return a BUY / MAYBE / AVOID verdict, including score, reasons, and red flags.
• Saves results back to Google Sheets, updating or creating listing rows and keeping history consistent.
• Sends Slack alerts for listings that are not rated AVOID and are either new or meet your configured minimum price-drop threshold.

Use cases

• Daily monitoring of Immoweb listings without manual spreadsheet updates.
• Fast screening for deal hunters: highlight only price-changed opportunities and filter out obvious overpricing.
• Operators running a SaaS workflow who want audit-friendly outputs in Google Sheets plus immediate Slack notifications.

Technical details

• Apify Immoweb scraper API (API token via HTTP Header Auth)
• Google Sheets (Service Account credential; de-duplication and historical tracking)
• Google Gemini (structured BUY/MAYBE/AVOID labeling)
• Slack (alerts for scrape failures and qualifying deal candidates)
• n8n nodes include: if, set, code, limit, slack, sticky note