You should try out the Public Mixte! It is upright but not quite as upright as the one you posted. This means it'll likely be easier if you run into hills. I have a Public c7i. Works well on the flats and slight hills. Steep ones weren't great. But I saw someone on their blog used one like mine to tour Europe! They are sportier than proper dutch bikes so you should check it out!

They are just as cute as the one you posted.