Heidi’s place should be your first choice when staying in Oslo. It is a beautiful apartment with everything you could possibly need for a comfortable stay. It is very well located just 2 minutes walk to bus 54 to Oslo station etc and bus 21. There is a small supermarket around the corner and a COOP 5 minutes walk away. Lots of restaurants nearby.
Heidi is a fantastic host, always quick to respond and provides lots of helpful information.