A small, ground-floor flat in a nice neighbourhood; suitable for two people. It was only about 15-20 minutes walk from the centre (and a lovely walk too), which is very handy as public transport can be pretty dear in Oslo. Bed linen and towels were provided. All in all, the apartment was quite satisfactory for a short stay.
We didn't meet the host Sara, but online communication with her was prompt and attentive.
Oslo is a fascinating city, with very friendly and helpful inhabitants – well worth a visit.