Centrally located in a charming area of Oslo, Kampen.
Please note that the flat is in an old building with high ceilings. There is no elevator and the flat is on the 4 floor and that may make you tired or give you a sense of having exercised a bit. :) The entire apartment is for guests and it is not shared with the host.
The apartment is two stations from Oslo Central Station. Considered city centre. You can take the metro or bike and walk.