The place is very nice, very clean. There is one minor cosmetic issue where the door stop is set too far back that the handle goes through the drywall, so please try to be careful. Otherwise, the place is very sharply decorated and has cute little features like a pac-man arcade table.
I would definitely recommend this spot for a group of 2-4. It'd be a great spot for two couples taking a weekend to explore the city. At 5-6 people, with bags and all sleeping arrangements out, it is a very tight squeeze. Also some of you will be expected to sleep together on the queen or sofa bed, so if all 5 or 6 people are not comfortable sleeping together, consider bringing something additional like a sleeping bag. Also, one of the listed sleeping surfaces (the blue couch) is considerably smaller than a twin mattress, so people significantly taller than average should be careful.