I've been staying at Ray & Armines' apartment for five days in summer. Because summers in Vienna can get extremely hot, Ray brought me a van to keep the room cooler and more bearable to sleep in. Ray, who did my check-in, is an extremely friendly, caring and responsive host. Rarely have I felt so welcome. Apart from the excellent check-in, which was on time, Ray & Armine are fast to respond to any questions you may have beforehand, or during your stay.
The location of the apartment - and I lived in Vienna for some time - is superb. It is close to all main attractions. The city hall (from which you can take many public transportation options, such as the metro, the tram, and busses) is only a 10-minute walk from the apartment through the cosy park of the campus of the University of Vienna. Across the street, there is an excellent coffee place to grab an espresso or get a light breakfast.
In terms of the apartment itself, it offers everything you need for a city trip of a couple of days to this wonderful city. The kitchen is tiny but has a fridge, and the basic equipment.
Should you want to stay in Vienna, I would wholeheartedly recommend you this apartment!