I stayed at Bente's apartment for 3 nights. It is located on the part of Grunerløkka near to Grønland. The streets are a little noisy during the day perhaps because it was near the tram and buses..
The room is small, but adequate and there is a balcony both at the front and back of the flat.
There are a few strange neighbours in the area, but it is relatively safe and convenient for town..