I spend almost three months at Halgeir’s place and I enjoyed my stay!
The location is perfect. Practically all the tourist sites are reachable by feet. That was perfect for my visitors who saved on the public transport tickets (which are not so cheap here in Norway :)). Otherwise, Oslo central station is just 6 minutes away and you can take every T-bane there. Halgeir is a very good host. He always responded within minutes and made me feel welcome in Oslo. During my stay the fridge in the apartment broke, and Halgeir arranged for a new one in the same day.
Thanks for having me!