Very nice extended weekend in Oslo with plenty of sun. I stayed 3 nights in this apartment. It is fully independent and the owner Espen is living in the same building to provide support in case of need. He was very responsive by chat and very helpful.
The apartment is cozy and functional. It has all the space needed for 2 adults. Just be aware of the low height at the mezzanine bed and that you have to climb to it.