Mona's flat is very well located in a cool place of Oslo and it is quiet at the same time. The inside of the flat is welcoming and we felt like at home straight away. Mona is a great host, very responsive and caring.
We spent 3 days in Oslo and almost did everything by feet (it's about 30 min walk from the harbor and it is a nice walk along the river and through the city center).
We strongly recommend to stay at Mona's!