Think this is a great idea, I would have paid for this when we were buying our house. Especially for one feature: let me give you a list of properties (perhaps forwarded from my agent, or e.g. a Zillow search) and get back the "enriched" listings with your added insights. It'd be great if I could then weight different factors (local schools, walkability, etc.) to stack rank them.

With a once-in-a-century shakeup in commission structure for Realtors, you're building this at a very interesting time.

Happy to chat more if you'd like to bounce ideas around.

edit: Also, I think you could easily monetize this by charging agents (or their brokers) for it.