This place is like being in Heaven. The apartment looks exactly like on the pictures (even the flower is the same :) ). When you open the balcony door, you can hear and smell the sea, with an amazing view. The apartment is super clean, with great location. It is 12 minutes bus ride from the center of Oslo. The bus only goes in every 30 mins so you need to do some minimal planning, but it is definitely worth it as this area is soooo much nicer than the center. If you want to have your dinner in, I would suggest to bring your food from the central - although there is a small shop approximately 15 minutes walk away, it is much easier if you are prepared. Do not plan big cooking experience though, the appliances are simple and limited to a microwave (but hey, who wants to cook when you can be in the nature instead!).
There is a main road running next to the house, which might disturb some people, but the cars are not noisy enough to repress the noise of the waves, so it is not an issue. On the other hand, this means great transport to the city.
Kare & Truls are great, very welcoming. They give you very detailed instructions - you cannot miss a bus or get lost that is for sure!
The only downside for me was that the duvet was too cuddly so in combination with the comfort and view it was a real challenge to leave for a sightseeing :)