Very tricky question so be honest and say your true feelings.
Be honest. If you are comfortable in different roles, point that out.
Emphasize benefits to the organization. Things like, determination to get the job done and work hard but enjoy your work are good.
Be sure that you refer to something that was beyond your control. Show acceptance and no negative feelings.
Talk about having fun by accomplishing something for the organization.
Always have some questions prepared. Questions prepared where you will be an asset to the organization are good. How soon will I be able to be productive? and What type of projects will I be able to assist on? are examples
Be careful to mention traits that are needed and that you have.
Regardless of your qualifications, state that you are very well qualified for the position.
First, if you have experience that the interviewer does not know about, bring that up: Then, point out (if true) that you are a hard working quick learner.