MLS will be most reliable, as it is a verified transaction, I don't know where the others pull their data from so I can't speak to their accuracy.

One thing I’m a little worried about, is finding people who are reliable and who I can trust to manage the property effectively.

And if you think it's a waste of time finding a reliable lender than you're missing the big picture.

Don't forget to check the BBB also for complaints and reliability. 

-Get faucets that are known to be reliable and easy to repair (parts are common and readily available).

I will say that most jobs were in that suburban dead zone midway between Worcester and Boston (acton, Franklin, Medway) and you had to have reliable transportation. 

Public records (as per your link) is the source I'd recommend the least, for a number of reasons; they may be free, but the data is a challenge to get and use.The most reliable free source I know for this information is a title database. 

If I'm trying to BRRRR one of these properties (instead of sell it), how would I go about getting a reliable read on what my ARV is in a situation like that? 

I am also looking to flip near downtown as well but am having trouble locating a fast and reliable contractor.

Now, I just bought my first duplex and am wanting to structure how I collect rents so that it’s tax efficient, reliable, and time sensitive.