Definitely recommend Oslo!
Oslo was really cool. It was a bit windy but that's expected. We were there for 16 of Mai which was really cool to be a part of the parades and festivities. Oslo was much smaller than I thought and that made it easy to explore. The Holmenkollen Ski Jump was amazing to see. The views of the city from up there were incredible. I highly recommend visiting Oslo.
Insider Tip:Know a local and just explore. I have friend who lives outside Oslo and he helped showed us around. He also speaks Norwegian so that made it much easier too.