In short, he didn't finish the job months after the deadline despite his 21 days bid.
I didn't need the app immediately, so I could put up with delays, but abandoning the project at the very final step was quite irresponsible of him.
I trust, he had serious problems out of the work space, and regular travelling didn't let him focus on the project; but as a client, it turned out to become so frustrating for me. The worse part is that I still need to find someone to finish the app!