I stayed at Kirsti's place for 3 months whilst working in Oslo and couldn't have enjoyed it more. The apartment was very clean and well stocked with everything you need from just a weekend stay up to multiple months. There was lots of kitchen equipment to use, a lovely private bathroom and you even have use of the washing machine that's shared with Kirsti's house.
The location was fantastic, out of the centre of Oslo so it's beautifully quiet, but an easy walk to the centre of 2 minutes from the bus stop which will take you there. The area was also lovely and quiet and located close to the park of St Hanshaugen.
Kirsti herself was a wonderful host, was always quick to reply to any messages and did everything she could to make me feel at home.