The apt is separate, and you can come and go whenever you want.
The apt is in Majorstuen, Oslo, 5 minutes by metro from the central trainstation. All metro lines in the goes to Majorstuen station.
It is less than 5 minutes walk to the metro, tram or bus stop from the apt.
The park Frognerparken is a 5 minutes walk away where you will find the famous sculptures of the late Gustav Vigeland (Vigelandsparken), and in summertime you can enjoy swimming in Frognerbadet Open-Air Public Bath.