Mona's place is very well located, in the charming neighborhood of Frogner, close to public transportation and at a reasonable walking distance from the city center.
Mona is very communicative: she replied to all my messages and provided me with useful information before and after my stay. I engaged nice conversations with her and her daughter.
I found the room small for the price, but it's true that Norway is pricey. This was paid off by the cozy house and Mona's hospitality.
Overall, nice stay and warm atmosphere: I would recommend it.