We had a wonderful time in Holmenkollen as a family of four with very young kids. Kjetil and his family went out of their way to make our stay comfortable.
The apartment is spotless and big, the kitchen is very well equipped and Kjetil and his family made sure our children even had room to change diapers and had their own chairs for the dining table.
Public transport is close by and the neighbourhood is very beautiful.
We highly recommend this place to families!