The location of the structure is its great advantage, as it is very close to the Royal Palace and therefore to the centre. Also, the rooms are big enough (we were 4 persons), although the bathroom is not. And the people at the reception are friendly.
However, the structure also has some disadvantages. First, you cannot cook in the room. The most you can do is heat some liquids (milk, water etc.). It is not even possible to heat any solid food (e.g., slices of bread) because of the presence of smoke detectors, which are apparently very sensitive. This is what we were told at the reception. At the reception you can borrow cups, cutlery or a hairdryer, but if you ask for a frying pan they tell you to be very careful with the smoke and discourage you to use it.
The second aspect is parking. They do not have their own. They have an agreement with a covered car park, but it is several hundred metres from the hotel and very expensive (it would cost 590 NOK per day, but they give you a voucher for 200 kroner). There is another municipal park that is very close and costs 400 kroner (no voucher).
Third, minor, aspect is the accessibility of the structure, as it is on the second floor and you have to take a small lift to get to the reception.