Thon Hotel Gyldenløve is centrally located in Oslo, in a reasonably quiet place. Our room was spotless and modern, albeit with a very small bathroom. The bed is comfortable, the TV is big and it's all rather nice, and at a good value all things considered.
Breakfast is good by international standards, and average by Norwegian standards. It's served in a adjacent restaurant, which unfortunately is small and crowded, even at 07:00 in the morning. Their gluten free selection is good but not excellent – bread, sweets and cereals are all available, but nothing fantastic. The coffee is terrible.