Ninas apartment is just perfect!
It's very well equipped. Our son liked the toys and the playground in the court. A supermarket is just around the corner. There are several cafés and restaurants in Sagene, as well as a nice bookshop. It's close to Grunerløkka and the river Akerselva. We went swimming several times in the Akerselva.
Nina is a very friendly person. Communication was top. It's definitively a place one wants to come back to.