Jon was away for work when I stayed in Oslo, but his friend Csilla kindly showed me around the house.
The place is close to many transport services, which was great for me. There is very good Wi-Fi that I could use to work and to plan my trips (the roaming did not really work in Oslo!). There is also a very nice park to take a walk nearby, and also one of the many rivers that seem to cross the city. As for eating, the kitchen was available, but there are also many supermarkets and a few affordable restaurants nearby.
The bed was comfortable and the room silent, no noise coming from the streets outside the house. There is also a small balcony that is a great spot for having breakfast/dinner.
The stay was overall very good, and I would gladly ask Jon again if I need to go back to Oslo.