Cube Travel Pro - First Tour (HELP)
We try to avoid specific product recommendations here.
Looking at the specs, the things that jump out at me are:

The weight. Even for a touring bike, this is pretty heavy. It does include kickstand, rack, and lights, which makes up for that somewhat.
The gear range: this has a planetary gear with a 307% range. That's OK for in-town riding and riding over fairly flat terrain, but if you're going to be doing any serious climbing, you'll want a wider gear range than that.
Flat bars: they give you only one hand position. I prefer drop bars, but this is a matter of personal preference.


The most obvious tradeoff with size is that a smaller frame will pull your torso down more (which can be fatiguing if you're not used to it), a bigger frame will have less clearance when you're standing over it. Pick your poison.