My choice had no separate bathroom. The room was just big enough for two single beds, no TV, no kettle, nothing. But the shared bathrooms were spacious and efficient. Plenty of water pressure on the tap so that you can finish-off your showers.
Only problem I experienced was the insulation between rooms. I had to bear a man coughing for a long time through the thin wall.
Breakfast was very good. You can prepare your own lunchbox for 1,000 ISK.
There is no shared kitchen but you can use a big fridge for your food.