My friend and I stayed here for 8 days and had a great stay. Nina was a kind, attentive, and responsive host - when we arrived, she gave us a rundown of the apartment and also provided strawberries, bread, butter, and jam in case we needed breakfast the next morning. She responds really quickly and was able to accommodate us after our flight was delayed a day, and she even provided instructions on the best way to get to the apartment (and warned us to leave earlier on our last day since the airport would likely be busy that weekend). The apartment itself is super spacious, especially for 2 people. We really liked the large bathroom which a lot of airbnb's in Copenhagen didn't seem to have haha. The kitchen was stocked with lots of pots, pans, and tableware (including a pretty large collection of Royal Copenhagen dishes!)
The walk from Osterport station to the apartment was around 10 min long on cobblestone streets, which isn't bad at all. I was carrying a pretty heavy suitcase though, so it was definitely difficult to drag that along the street for a bit. There is a park across the street and I think there's also an elementary school nearby, so you can definitely hear kids running around in the morning.Otherwise, location is really good - everything is pretty much walking distance (Netto is really close by) and you can always use public transport to get to some places faster.
Overall, we really enjoyed our stay and would definitely recommend to anyone visiting!