Backstory: I've always thought it would be fun to live in Austin, Tx. For fun, I pulled up zillow in Austin and tried to pick a rental that is downtown and affordable. Then I got to thinking, what's a good area to live?
I pulled up hoodmaps, a crowdsourced heatmap describing sections of cities. After viewing a few areas... "wet dogs", "drunk hipsters" and "mexico"... I didn't find it that useful. There are tags for co-working and coffee spots, clearly aimed at "digital nomads."
The Idea: A professional version of hoodmaps.
Deep Dive: Create a crowdsourced heatmap for users to rank areas based on their livability for categories. You could define the categories as:
Each category could have a rating, giving the users filterable widgets to find their ideal place to live.
Validation: Hoodmaps is pretty popular in the nomad/travel community.
Monetization: You could sell ad space, I'm not sure anyone would pay for this service.