Zillow leaves a lot to be desired but it's a good place to start researching. The visuals alone do that.
I wish they would add a feature that allows searches by the number of levels a house has--one story; two stories (or more); unfinished basement; finished basement, etc.
The thing is, a LOT of us are getting older and only want to consider a one-story home. Falls are a concern, but even more than that is the day-to-day difficulty of climbing and going down stairs.