The location of the apartment is indeed very central but quite. Everything is in walking distance. From the central railway station it's a 10min walk. In case you have luggage, there is a tram stop right in front of the building.
You share the apartment with your host Irja. Everything was clean. The bed is very comfortable and there is even a table in your room in case you want to work or plan your next steps in Oslo. WLAN was included and worked fine.
Irja is great and gives lots of information what to do and how to move in the city. She responds extremely quickly on mails and SMS over the AirBnB platform. I would definitely stay again at her place.
P.S.: The breakfast was a nice surprise, which I didn’t expect.