Natasha's flat is exactly as advertised: a clean, modern apartment in an historic building very near the heart of the city. Both the historic city center, and the newer Aker Brygge neighborhood are easily walkable from the apartment.
The street on which the apartment is located is closed off to all traffic, except for vehicles making deliveries to buildings on the block. This made for a generally quiet street, though it posed a slight complication for getting dropped off by our taxi driver.
There is a Salvation Army drop-box and the neighborhood recycling bin located immediately across from the building entrance. This made me a little nervous when we first arrived (there were scavengers combing through the Salvation Army box), but wasn't really a problem over the course of our stay.

There is a tram stop (line #12) just a half-block away, and a major subway / train station (National Theater) about two blocks away, so venturing out to locations beyond the city center was very easy -- and getting to the airport via the airport express train on our departure day was very easy. There are two grocery stores within two blocks in opposite directions from the apartment.
The fully-enclosed shower is completely functional, but is compact by American standards. A very large person might find it cramped. There was plenty of available closet space, which was nice.