I have a couple guys coming in next week for estimates. I'm expecting
around $4-6 per square foot, since there is alot of paint on them and
many nails.

The floors I'm concerned with now, have already been sanded and staind
by the previous owners. From what the real estate agent said, they were
reluctant to do any work at all, so i'm sure they did it as cheap as
possible. I just want to do what I can before it is rented.

In the upstairs bedrooms, I have been trying to decide whether or not
to refinish those floors (vs. carpeting). One of the floors is pretty
nasty and has a big stain on it (smells like urine). I'm thinking that
the hardwood is better, but if I have to pay close to $6 per square
foot, the 3 bedrooms will cost be a fortune (12'x10' , 15'x13' &
12'x10')