Awesome about the humidity being fine, and congrats on being one of the very few users here from Europe and maybe the only one from Denmark. I know an infantry officer in the Army from Denmark and he's a great dude, so if you are anything like him then I'm sure that you are as well!

As for the vacation for a week, you should be fine. As long as the water dish holds at least half a liter of water and isn't over the heat source it won't dry up and your snake will actually probably enjoy a week without being messed with.