Peter’s place is a very close to the city centre. While it’s very possible to walk from the Oslo central train station (Sentralstasjon; or Oslo S), I wouldn’t suggest you walk if you have luggage. Better to take the bus.
Peter himself is an artistic, creative renaissance man with an interesting life and experience.
Peter is particular about arrival time, and is very upfront and clear about the rules of the household. He was very kind to allow me to do laundry towards the end of my stay, and help me with printing my departure ticket.
A note for travellers: I stayed here in the summer (July 2019) for almost a week, during a heat wave in Europe. It was very hot and humid in the city.. and it appears homes in Olso do not usually have air conditioning. However, Peter’s place has AC downstairs, but not for the upstairs room where I stayed. It can get quite hot in the room even at night if outside temperature is 23C+.