My wife and I stayed with Koy&Svein 1 night, and we truly enjoy being in their beautiful and well maintained house.
They prepared the room earlier than a scheduled check-in time, and Svein gave us an excellent orientation on what to do and how to spend time in Oslo.
Even those there were 2 other guests in the house, it was very quiet (day and night) and there were no conflicts with the bathroom usage. We also could safely park our rental car either in the rear of the property on on their quiet street in front of the house.
We will definitely recommend Koy and Svein to singles or couples!