Comfort Hotel Xpress Central Station

Plus: Clean, friendly staff, great WiFi, perfect location across from train station and main tourist road (Karl Johan Gate), close to many tourist attractions, room has a minimalist desk and chair for laptop/writing/books, etc. Was satisfied with my stay - being next to the train station and main subway station is perfect for getting in and out of Oslo as well as exploring the city by public transportation (and walking everywhere by foot is easy, too).

Minus: In less expensive cities could get more for your money (but Oslo is very expensive in general). Rooms are small but not too small for those just wanting a place to sleep. Very few amenities (e.g. no daily room service except for a fee, no breakfast, etc.).