Really well situated small apparent with all amenities (cooking stove, fridge, washing machine). The location is great for exploring the city and the host provided interesting tips for trips.
Being located in the centre has also some cons. The streets can be noisy if you are used to sleeping with the open window. Luckily, this is nicely solved by earplugs provided by a host. The other issue is that there public light shining directly to the apartment and no curtains to close windows. Host provided sleeping masks but not everyone is used to sleep in them and having curtains would be IMHO much better solution.
However, this place is overall a great choice for good money for visiting Oslo.