Nice location near Schluchsee, expensive wellness ...

Nice location near Schluchsee, expensive wellness resort, good breakfast. The atmosphere is old school fancy, except for the wellness part, which is modern fancy and I liked a lot.
Small details like umbrella and hiking backpacks in the room were very nice surprises.
Some other small details like elevator on my side was just until 1st floor, my room being in the 2nd floor were surprising, but not necessarily very disturbing for me personally.
And the location at the big street was noisy, but still bearable. The view from the balcony was very nice if you disregard the big street.

I wanted to give 5 stars but WLAN was simply unusable. At least in my room. I mean simple googling, not even talking about Spotify or YouTube. Since there was a bad signal from my phone provider as well I had to live without Internet.
I think for an expensive hotel this shouldn't be the case.