Mathilde was a lovely host. Super responsive, accommodating, and friendly. I was only in Oslo for a weekend, but I got to know Mathilde well and loved staying with her.
The flat is brilliant, great decor, comfortable room, good shower/bathroom etc. Everything you could ask for.
It's 5 min walk from the trendy Grunerlokka area and 20m walk to Oslo Central Station.
If I was coming to Oslo again I'd book this place again in a heartbeat!