Barbara was very friendly and helpful. We soon found out about public transportation. (zone 1). There are trains and busses to travel into the city center. if you do not want to walk too far, you should take the bus to Astun.
There are nice beaches around. We were a family staying there for one beautiful week. Sommertime :)
Our kids liked very much the technical museum but also island hopping and swimming in the warm Oslo Fjord was a big highlight.
Thank you!