They charge extra 5 EUR if you'd like to pay with credit cards, only cash or v-pay cards do not require a surcharge. This is a 5* hotel and charging extra for paying with Visa looks like a little greedy policy to make extra money.
No way to use Wifi on the 4th floor - just no signal. And if you want to connect to Wifi in public areas, it is not free plus you have to do a separate registration with a service provider, meaning you need to complete a very long form and enter your credit card details. It is very inconvenient, especially from the phone. Even 2* hotels manage it better, either with the code or simple sign in.
The "exclusive" room description says it should have a balcony, when in reality it doesn't, there is a construction going on. The hotel kindly waived the extra price, but the description on booking.com is still incorrect.
The breakfast is served until 10 am, even on Sunday.
Won't stay there again.
The lobby is very luxurious and quite impressive. Swimming pool and especially sauna areas are excellent, about 10+ different saunas, breakfast and dinner very-very nice and good value for money. Location is very central, on the banks of the small river.