Concierge.com's insider take:

Part of the First collection—a contemporary design hotel chain in Norway, Sweden, and Denmark—Grims Grenka is one of the more centrally located Oslo hotels. While the public spaces, including the sleek lobby and extremely popular summertime rooftop bar and terrace, have more aesthetic appeal, the 50 rooms are very comfortable and quite roomy by European standards. Some of the best views are from the suites overlooking the Akershus Fortress. The room decor is pretty standard throughout, with either dark wood floors or wall-to-wall carpeting, beds with cove lighting underneath, and twin duvets piled on top and soft, angular couches and chairs in chocolate brown. The bathrooms, all with rain-head showers and some with soaking tubs, have frosted-glass walls to let light from the bedroom inside and give a more open feel. A hearty breakfast spread, included in the room rate, features Norwegian fish, cheeses, and meats. Local and organic raw food are the specialty at the stylish, candlelit restaurant, Madu, just off the lobby.—Terry Ward