Switzerland to Italy 2 week

I've done Switzerland and Italy separately, so not really what you're looking for, but I highly recommend Interlaken in Switzerland. Lots of beautiful mountains and lake views, even in the off season. And it's in a pretty easy distance of Bern and Zurich by train. I wasn't in charge of the itinerary, so I actually can't remember what I saw there, but I do know that we went to the top of Stockhorn. The "Three Sisters" peaks (Eiger, Monch, and Jungfrau) are also a big draw, but we didn't have time to go to them. From there, it also seems like it would be a fairly straightforward train ride to any of the cities in northern Italy like Milan or Venice. My family did a week-long land tour of Italy when I was in high school, so 18-year old me really enjoyed getting to see a lot of places that I'd heard about, and Florence was my favorite of the cities that we visited.