Apéron is definitely a great option if you are looking for a more "homey" Hygge experience in Copenhagen. The building is quite secure, and there are plenty of security measures in place between the exterior of the building and your units.
The staff are very communicative, and prepared me well for my stay. The apartment finishes were absolutely to my expectation in Copenhagen, and the ample space in the living room and kitchen were a nice surprise. Some of the windows do not open, but it was not hot when I was staying there so airflow was not an issue.
The bed was not as comfortable as most other beds I have slept on, but I look for a firmer sleep and this bed was quite soft. I loved the blackout curtains, which were helpful to fight jetlag.