With all other word chain type quizzes I have played on Jetpunk, the last letter of the final answer is the first letter of the first answer. As I didn't get Paris straightaway it threw me completely that the answer didn't start with W (end of Warsaw). Might you consider a change? Good questions, though - great to have some less common cities too.
Agreed, I got all but the summer olympics one fairly easily and then realised I had over five minutes to try and think of a city with that first and last letter, doesn't need this much time.
Oxford is not the oldest university in the world and not even in Europe. Arguably Europe's oldest university is University of Bologna. But even then the oldest universities would be the Northern African madrasas.