So definitely don't take basement rooms in the Annex part!
First room was damp smelling, dirty (including carpet and sheets), a broken sink in room and a walk through dark creepy corridors to the bathroom! Possibly not meant to have been booked out to guests...?
Fortunately, when I requested, helpful staff moved me to a better room, not in the Annex part of the hotel.
Lowish cost considering last minute and good location (10 min walk to Kings Cross), super no frills stopover for lone traveller without being a backpacker dorm.