"Wakeup wasn't a super cheap hotel, but it was good my comparison for Copenhagen. It was a budget style hotel with smaller rooms, similar to an Easy Hotel but a little bigger. There was plenty of room and the shower area was clean and didn't leak water under doors, as some hotels do.
The hotel itself was huge and there were so many guests. This made breakfast a bit busy after about 7am, but the price of the breakfast was good value and the selection was really good. They had fresh, warm bread every morning and these little pastries that were just delicious. I would definitely recommend the breakfast.
The staff at breakfast were numerous and constantly refilled the buffet and collected plates.
What I loved most about the hotel was the check in/out procedure. It can be entirely done via an app, without even using the terminals in the lobby. Your room key is then on your phone. The unlocking of the lifts was sometimes a little unresponsive though.
The hotel is right around the corner from Kongens Nytorv, and the Metro there. That Metro station will connect you easily to the airport. I actually walked everywhere in Copenhagen. It's a very walkable city."