The hotel is well located in the centre of Stockholm within walkingdistance of many tourist attractions and public transport like the central train station.
The rooms in the basement, which I stayed in, don't have any window and are very small and very basic, and the rates for these rooms are therefore a bit lower than the other rooms in the hotel. My room was not cleaned, which was a bit dissapointing, and the restaurant was overcrowded for breakfast with long lines just to get in to the restaurant, so the restaurant was obviously underdimensioned compared with the number of rooms in the hotel, and I therefore ended up buying breakfast at the 7/11 on the corner.
So if you want a relatively cheap room at a good location and are OK with a very small and very basic room without a window, the rooms in the basement are a good option. Otherwise I would go for a bigger room on the opper floors.