This hotel was lovely, and the staff was extremely helpful and welcoming. The décor is great, there is a nice living room and balcony, and the breakfast was delicious. The hotel is kept very clean.
However, comfort was not what I expected. The place is very noisy, the room doors provide no sound isolation whatsoever, and the layout means that you can expect to be woken up throughout the night by guests coming back and in the early morning when staff comes in. Combined with the shared bathrooms, this made me feel like I was staying in a shared AirBnB, and not a hotel.
I found the bed very uncomfortable - I understand the appeal of vintage, but that doesn't mean you need to have bedsprings from 20 years ago. The wifi was also very poor, it was basically unusable by more than 1 person at a time. Don't expect to be able to work from the hotel.
Overall, my experience was mixed - if they did some upgrades (better internet, new beds, soundproofing the doors), this would easily be the best hotel in Copenhagen.