We are frequent AirBnb guests throughout the US, Canada and Europe, and this was one of our favorites. The apartment is in the fabulous Grunerlokka 'hood, about 3-4 blocks to a few different public transit stops most notably the 11/12/13 trams to the centre. There's a Kiwi grocery at the corner (limited selection discounter like Aldi or Lidl), which you will be grateful for in wicked expensive Oslo. The smaller square next to the tram stop has a fantastic flea market on the weekend.
The building is newer and has an elevator - so nice with the luggage - but the apartment is on the first floor (aka second floor for us Americans) so usually we just walked up and down. Getting to the apartment from the outside involves several doors and two different calls to the host from entry systems, it's unusually complex, but once you've done it the first time it's a breeze.
The apartment is laid out perfectly as shown the photos. Open concept living/dining/kitchen. Kitchen has all you need to cook in the unit. (Be aware there is no microwave and the coffee maker is a pour-over style.) TV has AppleTV so you can watch Netflix etc. via your own accounts. Bathroom is roomy and extremely well stocked with items you may have forgotten or run out of. Finally, the bed is super comfy and very large - a little bigger than an American Queen - compared to many you'll find in European AirBnbs. There are lamps and tables on both sides of the bed! If you will need to do laundry, ask Tuva how the settings work. We didn't and so had to guess a little.
We were welcomed by Tuva, Tone's daughter, in person, who showed us around the unit and went over all the details. Communication was great throughout, very quick and helpful responses.
Highly, highly recommended! If you are debating where to stay, book here! You won't be disappointed.