From the airport
From the airport it is possible to take the train directly from terminal 3 track nr. 2. Change train at Copenhagen Central Station to the S-train with towards Holte St. Get off at Gentofte St. From here you can walk to Gentofte Hotel in 7 minutes. 

If you take a taxi from the airport the price is about DKK 400,- All taxies take taxameter and will accept major international credit cards.

From the Oslo ferry
From there you can walk to Nordhavn Station in 5 minutes. Take the S-train towards Holte Station. Get off at Gentofte Station. From here it takes about 10 minutes to walk to the hotel.