Had a great stay at the den, for a girls weekend away. The location is good right next to the danish royal castle, with what you need within walking distance. The fresh apartment could easily accommodate eight women, and the two bathrooms did help getting everyone out the door in a timely manner. A minor downside was a minimally equipped kitchen, with few glasses and no large bowls. No way to play any music (no speakers or tv), probably to avoid parties, but a bit annoying if you just want to play some background music. Also be aware that three of the bedrooms only have tiny windows, so getting that nice cool air in is not possible. They have compensated with table fans in each room, so the air was ok (at least in October).
I would go back, and recommend the Den for larger groups.