We highly recommend staying at Gunda's place! The apartment is really nice and welcoming. The kitchen has everything you might need and the balcony is awesome.
We walked to all major sightseeing hotspots and also enjoyed the nice neighborhood of Grünerløkka where you can find lots of nice little shops, cafés and restaurants.
On top of that Gunda is really nice and sent us some useful tips before the trip and answered immediately to any of our questions.
We would always come back :-)