Number of beds/baths, acreage, sufficient room for parking, quality of neighborhood, signs of construction in surrounding area, and many more factors.Something I have enjoyed doing while starting out, is rather than driving around to every house on the MLS...take a quick look at the property on Google Street View and run hypothetical numbers on the projected performance of the investment.

i wouldn't think that a seller being willing to provide financing would be a big issue; in fact, it doesn't really change anything.Ultimately, the quality of the deal is in price and terms.

I'm not sure what to do in these situations, but I'm hoping a quality buyer or seller will come my way!  

If your property appreciates because you did repairs to increase quality of living you can (and should anyways) raise rents every year at a small amount at a time.If your investment strategy is to settle for $100 a door and it takes 30 doors to replace your income you might want to run some different numbers depending on what type of property your looking at.With a single family home depending on your area you can do the math to see how you can get more than $100.

You need to find out more and put the numbers together to determine the quality of the investment.

There is also @Brie Schmidt from Chicago she also provides a great deal of quality content on Income investing.Don't hesitate to let me know if you need anything.Eric.

Buyers of one of our properties are requiring an one year builder's warranty and we are "debating" if my company or GC's company should provide the warranty.We are not concerned about the quality of work that was done but I want to make sure everyone is covered. 

Note buyers are generally looking for a certain investment yield and quality level. 

What are some of the due diligence you would do to ensure they are repairing are up to the qualities you want and ensure they are not pricing extra?

I try and recommend the good contractors out, as quality work and quality people are a dime a dozen!