oh… it seems that my reply was still saved as draft for the whole time… 
So, time to give an short update ^^
first - what I wanted to write earlier: thanks for the information 
Now, the update: I’ve decided to go with the Siemens Machine - and have tested the core homeconnect as well as the alternative from ekutner…
The Alternate integration is really great, but creating automations can sometimes be a bit difficult due to the way it is communicating with the cloud services…
This seems to be easier with the core integration - although you do have way more options with the alternative one… and I am pretty sure - when I will find some time, I’ll also get my automations to work in each way as I want them to do