Alfonso's apartment was great. It's location in Oslo is really nice. Its located on a main street in Grunerlokka, which is a really exciting, eclectic and vibrant area of town. There are many middle eastern, south asian and east asian restaurants in the immediate vicinity, and within a 2-5 minute walk there are highly rated bars, pubs and restaurants.
Alfonso's apartment is the 5th and top floor of the building, which makes it quiet even though its located in an exciting area. The room itself is interested as the roof slopes down. If you are taller than 6ft (184cm), it can be a bit difficult to navigate the apartment near the kitchen and TV, but the apartment itself is wonderful. It was spacious and clean.
The apartment location is very central. I was able to walk to Oslo S train station in less than 15 minutes, and was able to get to the main strip by Radhuset and the Royal Palace in less than 30 minutes of walking. There is also very convenient bus and tram stations located within 100m of the apartment which is nice during the colder months where walking 30 minutes can be difficult.
I stayed at Alfonso's apartment for a business trip and it satisfied all my needs. I would recommend staying at Alfonso's apartment if you're in Oslo.