You can catch the Metro directly from Terminal 3 to Kongens Nytorv. It leaves several times per hour and you do not need to make any reservation. Get off at Kongens Nytorv (the trip takes 14 minutes) and walk to our hotel Copenhagen Strand, which takes about 8 minutes.
Taxis to and from the airport are approximately DKK 250. All taxis run on a meter and you can pay by most major credit cards.
When leaving the boat from Oslo you can get into the city centre by the free bus 20E from terminal Dampfærgevej via Østerport Station to Kongens Nytorv outside the department store Magasin du Nord. The hotel is located within walking distance from the department store.