Christina has a really stylish place! She met me on check-in and always responded very quickly.
I was only staying two nights and spent most of my days in the city. You can walk about twenty minutes into the center or you can cycle it! There are various options to get around if you don't have your own bike such as electric scooters ('Voi' or 'TIER') or bikes you can rent via a mobile app (which is what I did with 'Donkey Republic'). I would gladly revisit Christina's place for my next Copenhagen visit! :)