The hotel itself is located slightly outside of the old town of Überlingen. The checkin process took longer than expected as the staff member was not very familiar with the registration system. Apparently there is a tax foreigners must pay if they are staying as tourists. The staff member put one of us down as a tourist and the other as a business traveller and then asked us both to pay the tax. Over all it just didn't feel very welcoming.
To access our rooms (east wing) we had to walk all the way to the back of the hotel, through the bar, the restaurant, the pool and the spa, and at the end the staff member gave us the wrong floor.
The rooms feel quite dated, but I guess this is exactly what regular guests (mostly retirees) feel most at home in.
The breakfast in the morning was probably the highlight, you can sit out on the balcony overlooking the Bodensee.