Nice room
The room for some reason surprised me given it is a 3.5 star hotel. It was very comfortable. I had requested a premium city view King room. It had lots of mirrors, lots of lights, lots of electrical outlets, a very comfortable bed with nice linens, and a large bathroom (shower only). It was ideal size, layout, and perfectly furnished for a one week trip on business. 
Beware it does not have an inroom safe, so no storing a laptop or other valuables. Also, no honour bar, so bring your own snacks (there was an empty fridge to store)! And most strangely, when I called down for room service, they told me I didn't have the right menu?! That was frustrating and turned me off room service!... so somewhat disorganized in that dept.
I booked the city view because for me it wasn't worth paying for a view of the river. However, what they don't tell you, is that it's worth paying for the river for another reason....... if you have the 'city view' then you may back onto the alley where about 15 different garbage trucks roll through each night emptying dumpsters... On the 9th floor, it's extremely loud. If you don't like listening to garbage trucks at night - pay for the view!
Other than that the hotel was nice. I didn't have much interaction with the staff at all. The gym is overly adequate for a 3.5 star hotel or any hotel for that matter - a variety of equipment, mirrors, towels, and a view of the river.
I'd stay again, but I'd pay the premium for the river view....... my guess is that facing Wacker is quieter than facing the alley!