Katrine’s place is in a very central spot - everything is within walking distance. If you don’t fancy walking, there are public transport options just around the corner (which I wouldn’t recommend as Oslo is such a compact little city which is best seen on foot).
Katrine is welcoming, friendly and always available for any questions you might have.
The apartment had all the necessary amenities which made my short two day stay quite comfortable.
I would definitely recommend Katrine’s home.