Kaja and Ramin were great hosts during the two nights I spent at their home. Their house is very cosy, and although it was a small room, the bed was very comfortable and I had good sleeping nights (very quiet neighbourhood). Their place is very close to the famous Frogner Park, and within walking distance (less than 10 min) from the Royal Palace (close to city center). They were kind enough to offer a nice breakfast. Ramin advised me some nice places to fast visit on my last day and Kaja lent me her bike pass from day 1, which was cool and very useful to use after my Oslo Pass expired. They are both easy going persons, and easy to talk with.
Overall, it was a nice experience, and I highly recommend this place if you come to Oslo for a few days.