Location, location, location. Cool neighborhood with restaurants, shops, grocery stores and transportation nearby (one stop from Oslo Central station). We felt safe in the apartment, in the building and in the neighborhood. The apartment was spacious enough for 4 adults (one bedroom/one sofa bed in living-room). Communication with Diska was good. The only (small) difficulty we had was understanding that 7-11 is the store from where you retrieve the key but once you figure it out, it’s ok. An excellent address in Oslo.
I also really liked the walk/run along the canal nearby.