Great - top! - location, beautiful setting, good style of hotel (design, interior, rooms, etc.), good fitness place on top floor with terrace (not the usual dark little room in the cellar), nice pool area as well (not huge, but nicely done), friendly staff. The gourmet restaurant was a bit over top (also in price range for me), but the variety with other wine bar food & beer garden - top park location!! - and most amazingly breakfast on the terrace overlooking the beergarden into the park. close to the river Rhine as well. Great for a jog in the park, even close enough to downtown to go by bike (for me). Overall I really loved my stay and will come back!
P.S.: only downer was that my room was towards the street with more traffic than expected at around 7-8am... (later was quiet again - and quiet at night!). For park view 'Studio' type of room is necessary to book! And tht's not a real studio, just a balcony attached...