When you chose a discount rate of 12%, that was the hurdle that you set (It is sometimes called the hurdle rate). What that means is that if your NPV is positive, you have achieved a return of more than 12% on your investment.
Now if you had chosen 16% for the discount rate, you would have calculated a negative NPV. So that would mean that you would not accept the investment if you required a minimum return of 16%.
If you were comparing several different projects, the NPV Analysis would go a step further. You would want to chose the one that had the highest positive NPV. If you still had money left, you would then chose the second highest positive NPV, etc.
You could have calculated this easily at NPV Calculator Click Here.
If your NPV Analysis is based on positive cash flows then it is good. If you have not paid attention to your negative signs and you have high investment costs or net negative cash flows, then a high NPV can be bad.
The higher the real NPV is, the higher the IRR is going to be. (IRR can be looked at as interest return that you are getting) Just like you would want as high a return on your savings(investment) as possible, you want as high a NPV as possible.