Finding a rental in Amsterdam is really hard. There are way more people looking for a house than there are houses available.
I would often react to a rental listing only to find out that I was too late (even though I reacted the same day it was posted!)
So I started building some scrapers that would check all the rental listing websites every 5 minutes.
Each time a new listing came online the tool would send me an email! This helped me find a really nice place in Amsterdam and I thought "why not build a small SaaS tool out of it)
Fast forward a few weeks and WoningAlert.com is live!
Let me know what you guys think!