The apartment is very basic and lacks a seating/lounge area for groups/families to relax in together - the kitchen is the only communal area with seats in it that you wouldn't want to sit in for more than a few minutes. Groups may also want to know that the bathroom door isn't lockable. And the apartment is 3 floors (about 90 steps) up a spiral staircase.
Other than that though, the apartment is centrally located and near to tram and tube stops, the beds are big and comfortable, there are plenty of glasses and bowls to use and we paid little more than £70/night - which per bed is probably cheaper than even youth hostels so you can't really argue with that.