As Hans Christian Andersen put it "Wonderful wonderful Copenhagen" and so it is, a wonderful city. Clean, with fascinating architecture both old and modern.
Caroline's apartment was as described with clean, sleek, modern danish style.
Being on the top floor we had a good view of the spectacular Tivoli Gardens fireworks display on Saturday night.
To start with, the Copenhagen Card is highly recommended, it can be purchased either at the tourist office at Central Station (København H), but be aware this is a sales office for a City tour bus, or from the official Tourist office about 200 metres from the station, turn left out of the main entrance. The card is not cheap but gives access to public transport and most attractions.
The best way to find Caroline's apartment is to use the Metro. From Central Station take line M3 (the red one) or M4 ( the blue one) 3 stops to Kongens Nytorv. Change to M1 (the green one) directions Westamager for 2 stops to Island Brygge. Across the junction is the 7-11 shop to pick Carolines key with the Sharebox app and the link Caroline sends. Cross the road and walk as far as the Brugsen store, turn right this takes you directly to Carolines apartment.
Enjoy.