We had a very comfortable stay and wonderful time in Oslo.
Mona was a great host. She was very flexible with handing over the keys (we had a delay of one hour, which has not been a Problem) and eventhough we only met her briefly she stayed in touch with us the whole time, making sure everything is alright and giving us tips and informations.
She even offered me to wear her shoes because of the muddy and snowy waether :-)
The studio was so cozy and we would always come back when visiting Oslo.
It was exactly as discribed, clean, warm and we missed nothing.
I can highly recommend staying there.