The location is great, just 1/2 a block away is a great coffeehouse & bakery along with public tram access. The only major issue, which is clearly pointed out by the Host in the property description, is that the apartment is located on the 4th floor and there is no elevator. So, just be prepared and physically fit!
You are also very close to Frogner Park/Vigeland Sculpture Park. There is a fully stocked kitchen with everything you could need to make almost anything you could think of cooking. There is also a pizza shop on the street level right next door and the food was great at a fair price.
The apartment is beautifully decorated in what I would term a Bohemian Style which fits perfectly as the host is a professional artist.
Heidi has some 'strict' rules about how she likes things done and trying to figure out the initial bedding linen and pillows was a bit confusing and challenging.
Having said all of this, I would recommend this lovely property and would rent it again when back in Oslo.