Just completed a 6 night stay here, on points + SUA into Grand King View Suite overlooking the Philharmonie. Was impressed with basically everything - the suite itself was fantastic (especially the bathroom), the service was top notch, breakfast buffet in VOX was good... and while we were too busy to use it much, the gym + spa + pool area is outstanding. My first Grand Hyatt outside of the US (where I've stayed at 3-4) and it felt like a whole other class of hotel. The location is fairly 'corporate plaza' but was very convenient to specific locations for our trip and also to public transit. Wholeheartedly recommend this property to anybody visiting Berlin.