Researching Comps on RedFin to Analyze Deals

[Emil Pinlac]

Would anyone be able to give me any actionable advise, or insight on how else to verify/analyze comps in certain neighborhoods?

Currently, I've just been doing deal analyses using RedFin or Trulia on whatever comes to market, and I have just been using their resources - namely RedFin's map (as shown in the picture), where it shows me how much the other properties are valued around the house for sale. As you can see in the picture - the house for sale is at $251k, however surrounding houses are anywhere between 214k and 321k, which puts it at a pretty good price for negotiation and/or forced appreciation if I fixed it up. 

Is this an accurate way of looking at comparables? Are these numbers from RedFin even accurate? Aside from contacting other REA familiar with that area, or property managers - are there any other websites that can either verify RedFin's numbers or give more specific information regarding neighborhood property values?