Erlind and Lisa are very nice hosts to stay with. I amvery grateful to have met them. The apartment is cosy, bright and welcoming. The room for me within this apartement is very good for a single person, you will have a desk and a wardrobe as well as a nice window which can be covered by a blind. The bed was good, I could sleep very well and the outside area was not noisy. In addition to that, it was possible for me to use kitchen, living room and balcony of the hosts. I had some very nice conversations with Erlind and he can tell you some places which might interest you to visit.
The apartment is located very centrally between Sentrum and Grünerløkka. Therefore, you reach every sight or area which is worth to see within the city by walking. The walk from Oslo Sentralstasjon is about 15 minutes (I think even less). If you leave the apartment you just need to turn around a corner and have many bars and restaurants around.
I can fully recommend this apartment to everyone who is travelling on his own to explore the city of Oslo!