This flat has central location with most of historical attractions and museums in walking distance, so the only time you'd need to use public transport would be on your way to and from airport. The room and wc is very clean and stylish and has everything you might need including toothpaste and umbrellas. Please remember that busy street also means loud, so take sleeping mask and ear plugs for your healthy sleep.
I would definitely stay here again whenever I come back to Copenhagen