Book it! Great value for solo traveler, great location and close enough to center (20 minute walk or 5 stops bus), super convenient (you walk out of Oslo main terminal and the bus stop is there). The airbnb is 1 block away from supermarkets and food. If you have luggage, be aware there are stairs because the airbnb is on floor 4.
Tom was an excellent host and very responsive. Gave lots of good tips.
The room is tidy and clean and warm in the winter. The bathroom is great, very modern shower head. There is a washing machine in the building complex but I never ended up trying due to laziness with the stairs walking up and down.