I recently stayed at GO Copenhagen, and it was a pleasant and comfortable experience. The hotel is clean, and has everything you need for a convenient stay.
Small size but decent rooms, and bathroom is alright.
The location is ideal, close to the airport and just a short ride to the city center, which made getting around easy.
5min walk to Tarnby station.
Reception staff Lisa and Annika, so helpful and always smiling, they helped me cutlery for food and also to open by suitcase due to key / lock issue.
They do have breakfast option, but I didn't tried due to travel, wifi is great, small but nice lobby area.
If you're looking for a comfortable and budget-friendly option in Copenhagen, I would definitely recommend GO Copenhagen!