The apartment was beautiful and in a very convenient location to access both West and East Oslo. As some reviewers have mentioned, it is very much a "lived in" apartment, but our hosts ensured most things were cleared away and even put out an air mattress for us to accommodate an additional person.
Communication was very prompt; Sigurd was always friendly and very responsive. We did have some communication mishaps, however. One of our hosts was to meet us at the train platform where we were arriving, but was nowhere to be found. Luckily, they quickly responded that they had forgotten and would meet us at the apartment. We had a little bit of trouble finding it, particularly from the train station (exit towards the Opera House and immediately turn left down the street/last platform), but upon arrival, Sana was very friendly and had waved us in on the street level, which was very helpful.
Two other odd incidents occurred on this trip - Sigurd had to return to the apartment the next day for something that was left there (we were out) and at some point, we realized the oven had been left on. We were lucky not to have any issues, but definitely a hazard.
All in all, we had a great stay, just a few bumps in the road, particularly with checking in.