This is a lovely apartment right in the heart of the old city. It’s extremely well looked after - very tastefully decorated and very clean. We enjoyed sitting on the little balcony in the late afternoon- it’s mostly pedestrians and bikes in the narrow street below so it’s not noisy.
There’s a nice vegetarian restaurant about 5 minutes walk away called Oslo. Also there’s a friendly and reasonably priced bike hire shop about 3 doors away. The city is very bike friendly- we cycled to the beach. It’s a very pleasant ride through the park.