I would highlight easy and clear communication with the host and excellent location in case Vienna is your stopover place as city's central train station is just in front of the building. If you like neo-liberal generic urban (mis)concepts of architecture then you will enjoy the view from very nice and spacious balcony as it gets really impressive especially under late afternoon lights so you might even think you're looking into computer 3D render.
I will definitely use this apartment next times when I am in Vienna, it's just convenient transport-wise and it's all new, calm, clean and nice. Very good value.