Me and my son stayed for 2 nights (weekend) and enjoyed it very much. The room was extremly comfortable, lovely bed and nice bathroom. Its also close to Tivoli garden which was the main goal for our stay.
My only complain is the check in. It took over 30 minutes to get to the front desk...but they were very polite and helpful when I first got there...
We booked the room at booking.com and payed § 300 for the whole stay which is very good in Copenhagen.

We have stayed in Marriott Copenhagen for 4 nights prior our Baltic cruise. Our room faced the cannel. We watched boat parade for 2 nights from our room (it could be weekend only). Kids enjoyed the parades very much. Location is very center even though it's not walking distince because we have yound children. But Bus 66 is right in front of the hotel. We bought the 3-day Copenhagen card and truly enjoyed our stay in Copenhagen. The only complaint is that food in restrauant is so-so, but extremely expensive, otherwise, it would have been a perfect trip.

Stayed at the Marriott Copenhagen for a business meeting, and found it to be an efficient, clean, and pleasant place. A little outside the main center of Copenhagen, it was close enough to walk to any part of the city, had pleasant views of the canal, and good breakfasts. Not a huge amount of character, but stylish enough to be memorable. A little pricey, but not beyond what one would expect for an urban location in this beautiful European city. I would certainly return to Copenhagen, and would be happy to stay here again.

The Marriott was a great hotel with wonderful beds but the location was a bit inconvenient for the major sites. We like the fact that it was right on the river but it was a very long walk to get to most things. All and all enjoyed our stay!