A great location, a cozy apartment, a comfortable balcony and a hospitable host. The apartment is kid-friendly - we stayed over with our 7 month old. Although I wish there was more natural sunlight in the apartment.
If you are visiting Oslo, the area this apartment (Tjuvholmen / Aker Brygge) is located in is probably the best and most-social. It's got a picturesque water-front, promenade to walk on and best restaurants in town.