We stayed for 4 nights and had an amazing holiday. The hotel is clean, comfortable and there is the option to add on breakfast if you wish. Our room was not on the same side as the railway track - we could hear a very faint hum of the train, but it did not keep us awake, and was actually quite soothing to fall asleep too (I'm a very light sleeper and I had no issues at this hotel at all).
The hotel is perfectly situated next to Østerport Station, so easy to get to and from the airport. There is a mini market next to the station with a coffee and pastry counter, which is much better value than the station itself. A 15 minute walk and you are in the centre of Copenhagen. We preferred staying here as opposed to in the centre of town, as the walk to and from the hotel is nice and chilled with lots to see along the way. I would definitely stay here again.