Both myself and a colleague stayed four nights in this beautiful apartment for a conference in Vienna. The apartment is gorgeous- spotlessly clean and very spacious. Everything has been done to such a high standard. It has everything you could need and more. Danielle, who met us at the apartment, couldn't have been more helpful, friendly and welcoming.
The apartment is a 5 minute walk from a ubann station so you can get anywhere in Vienna very easily.
The only negative would be we arrived and it was 33 degrees outside- some fans in the apartment would have made our first night more bearable. Thankfully the temperature dropped significantly afterwards and it was very comfortable.
I would recommend a stay here to anyone and would love to go back!