We stoof for 3 nights at the Hilton Munich City and would deffo visit again. Check-in was very quick (same with check-out, no long queues or waiting times), rooms quiet and the bed comfy. I'd especially would like to point out the pillows and the AC who runs super silent, brilliant.
The fitness area covers all your needs and if you like to have a never ending breakfast, book it at the check in. It'll save you monies and is really worth it. Park your car in the nearby garage, the price is fully ok and you don't get ripped off. You can even go for a swim at the river Isar whos close to the hotel. 5 min walk, not more. Would we go there again? Absolutely.