I loved everything about the Swissotel Berlin except the sky-high charge for WiFi. There is free WiFi at the business corner though.
I stayed in a Classic Room for about 140 Euro/night. Have to say this is an amazing value for a 5-star hotel in central Berlin. Even though this is the lowest level room, it was still very luxurious with a queen size bed, big TV, comfy chair by the window and my own Nespresso maker.
The location is very convenient too with the metro and trams right outside the door.
I'd stay here again, but probably book a level higher so it includes wifi.