The place is very well located near the palace and only a few minutes walk from National Theatre Train/Tram/Bus stop (where you can travel to and from the airport and most locations in Oslo very easily).
There is a Joker (mini supermarket) nearby, but I would suggest using the Kiwi supermarket towards the Solli Plass area (more options).
Overall a pleasant stay, but I had stayed over a long period, so if you are too, then be aware that fridge space is very limited and you can't really buy in bulk (meaning you have to buy food almost week by week), which is less ideal.
You share a kitchen, bathroom and living room, so if you're okay with that, then you are fine. If all 8 people stay here then scheduling time in the bathroom becomes challenging if you are on a work trip and need to be at the office at certain hours.
They are super quick to respond and happy to help if you have any questions. There are cleaners and you'll be asked whether you want your room cleaned, which is nice to have as a flexible option.