I have stayed here before and generally like the Kempinski range / brand. The location is very good, lovely service, nice rooms, etc. hard to fault the place.
However the neighbouring President Wilson is simply better in every way way and pretty much the same price point.
If you chose the Kempinski, request a room that looks out towards the lake instead of looking over the interior courtyard.
The gym is good. The breakfast room nice enough. The lobby is not a welcoming place where one would chose to linger. The hotel rooms are modern minimalist and well kitted out with modern technology. Wifi is free. All in all, perfectly good but hard to compare to the President Wilson.