Hey Andreas
Seems like you are on the right track with this device. I have used it extensively over a few months for my LG air conditioner, and it worked perfectly.
The setup was easy enough, you will most definitely be familiar with the whole process for Smartthings.
You will first have to setup your Cielo app, and register your air conditioner on the app. Afterwards you can move on to integrating the Cielo app with the Smartthings app from within the Smartthings setup.
The control screen will be exactly as you want, and you can control all the main features of the air conditioner from within Smartthings. You can also set up scenes, and all the other goodies of the smartthings app will also be available to you.
Also, Cielo has a pretty big database of air conditioners in their system, and you get support for almost all the air conditioners on the market.
Go for it, definitely recommend!
