I have been staying there on business for more than 3 months and generally I can recommend it. It is not a fancy hotel but rather decent and modest place (as most in Norway). As you know Oslo is terribly expensive so this place really gives you good value for money paid.
You will get small apartment with separate small equipped kitchenette. They do not serve breakfasts but few steps away you will find great bakery.
Recommended for some time, but I was already tired of this small size of apartment. Location - SUPERB!