I rarely get phone calls, but when I do I know that feeling of not being on the ball. I normally get emails. I can always take time to think of a response over email.

I'm a true believer of "go with your gut" If it didn't seem right, it probably isn't right!

Now that you've set up the interview make sure to follow through, but also make sure you are prepared for anything and have a nice list of questions with you so you can find out everything you need to know! Any more "bad feelings" then move on!