I had a great time in Gunn's attic. It is very cosy and spacious, and you have everything you need. And if not, Gunn is very helpful and will help you. She was a great host, very easy to communicate with and always helpful. It is close to public transport so very easy to get down town, as well as close to "marka" (forest) where you can go for nice walks and runs. I'd absolutely recommend this flat for a stay in Oslo.