Our family of five stayed three nights here on our first visit to Copenhagen. This is a very centrally-located apartment, close to the metro, trains and buses. It was easy to get to where we wanted to go. However, please be aware that this is not necessarily a family-friendly neighborhood. (We had just come from Prenzlauer Berg in Berlin, the nicest family-friendly neighborhood there.) Here we experienced a lot of street noise at all hours of day and night, as well as loud construction noise in the building courtyard during the day. The apartment is above the ground floor, you must walk up one flight of stairs. If it is a warm sunny day, the air inside gets very stuffy so you must keep all the windows open, but that means it is very noisy and there is always quite a lot of secondhand smoke coming in the windows from the street and courtyard.
I realize these issues are things the owner is mostly unable to control. All in all, we had a good visit to Copenhagen and are looking forward to returning sometime.