Although staff are helpful the state of the property is in need of maintenance. We booked a suite with a terrace/balcony so we would have plenty of space. On arrival we complained the room had no balcony (also no windows to open), we were moved to another suite. This time with a window that opened out but overlooked wire meshing and a plastic tree with no seating area. We asked if we could access the roof terrace and the sauna. We were told "no roof top terrace, no sauna and no microwaves available". For the 3rd time we were moved again, this time to room 20. This had a tiny balcony, cob webs on the plastic flowers, one plastic chair and mouldy black walls. Overlooking a washing line and 3 high walls. Only 3 coat-hangers in the wardrobe. The bedroom was plain, a gents sock sat in the corner full of dust and hair. The covers on the mattress knocked us sick - the mattress cover was absolutely full of dozens of tiny holes and there was a cluster of tangled human hair ....I could go on but feel sick when I think back. I complained and the person in charge sent a cleaner to change the bedding, sadly the management did not come to view the bedding. Had we not visited Vienna before and knew our way around the city etc (we stayed out of the apartment for a number of hours each day) we would have flown home early. Took too many photographs of the rooms and filth in the Citadella Residence to publish on this website, and they are not very family friendly.