Very nice place. The set up seems like old English (or Norwegian??). The house is full of stuff and it feels more of home. Communication from Heidi was spot on. Even though I didn't meet her, it was pretty easy to get keys. Also, the place is right at a tram station which connects to Oslo Central areas. Again very very useful. There are grocery stores, restaurant nearby. Many pluses.
There is one negatives though; The house is on 4th floor and there's no lift. Since I had a lot of luggage, this was a hassle. For people who travel lite, would surely recommend this place.