Possible rental purchase sounds too good

[John Heck]

I found a posting on CL listed for a month so far for a sale price of $12000 for the following:

Investors property
3 bdrm 1.5 bath city home with yard
Basement and attic can be finished off
Tenants currently in.
750$ + utilities has been going rate.

What questions would you ask the seller if you were meeting with them?  The pics look pretty decent.  It is a inner city row home.  Wouldn't the seller just sell it to the tenants?  I am eager to get started in a real estate venture so this sounds ideal to me...wondering that some experienced investors think.  Thank you! -John