I'll start by saying Martinka's place was awesome. Everything about it was more than what I needed as a solo traveler. Nice hosts, great communication, beautiful and fully stocked apartment, and great location (quick walking distance to the harbor, Tøyen, as well as excellent coffee (Fuglen) and pizza (ZZ Pizza)). There wasn't anything the apartment didn't have that I would have needed in my short stay. If I find myself in Oslo again, I would most certainly try to book again with Martinka and Bård.