From the Airport:
Take PREMIUM bus number 2018.
It takes approx. 40 mins to Copacabana beach and cost R$ 13. It operates from 5:30 am until 11 pm.
Take off at Avenida Atlantica, it's easy to spot because it is the long promedade of Copacabana with the sea and beaches on the left hand side. Ask to the driver you have to get off at 'Constante Ramos' or tell him the hotel 'Pestana Rio Atlantica'. This hotel is located just off the street of Constante Ramos, where the Copacabana Apartment is located.
Alternatively, take a taxi that will take you to Constante Ramos in about 30 minutes, for about 80 reais local currency.
Copacabana Apartment is located about only 10 minutes walk from both Cantagalo and Siqueira Campos underground stations.