We had a wonderful stay in Katrine's apartment. We didn't meet but she gave me great instructions on how to find the apartment. It is on the 5th floor with no lift but we were told that before so was not a problem for us.
Warm apartment with great shower, comfy beds and a great view across city. Walking distance to centre of Oslo but also very near bus stop. There is a supermarket a couple of roads away.
Katerine kept in contact for our whole stay but there was no need to contact her as we had lots to keep us occupied and we had everything we needed at the flat. I would definitely stay here again!