My wife was not too taken with Istanbul. I liked the historical items there, and meeting some Turkd and talking with them. The boat ride we took was excellent, beautiful weather that day. We agreed we wouldn't go back, but that has changed, one of the Turk friends we met just visited us and sketched out a tour we might like to do in 10 days or so. She seemed attracted to the idea. Turkey has some "things to see".
She really liked Tokyo mostly because we had an 8 hour private walking tour, I was impressed with Seoul. We're going back to the latter, our next cruise starts there again.