Elena's apartment is a convenient, quiet section of Oslo and she is a friendly host who was very responsive and communicated well.
My only cautionary advice is that I cannot recommend this apartment for those who need two beds over a longer stay...it is a one-bed apartment with a tired old couch in the living room that one could potentially sleep on in a pinch. I believe it is priced fairly as a one-bed...but don't expect a "sofa bed".