We had a fantastic stay in Vienna, and Eva's flat was ideal for us. My wide and 2 young daughters accompanied me, and there was ample room with the master bedroom and pullout couch. 2 couples could manage just fine.
The flat is in a perfect location right near an underground stop with good connections. We drove to Vienna and parked in the Museumquartier which is an easy 5 minute walk (15 euro/day). The area is quiet but quite near the heart of town near the Hofburg and museums. Excellent dining I. The area, especially Amerlinghaus right behind the flat which is a great Austrian biesl reasonably priced.
The flat is not air conditioned (as most are not) and did get a little hot at times . Eva provided a fan which made a huge difference in our comfort level. She also provided coffee for the Nescafé which was a nice add.
Communication with Eva was great prior to arrival. She had a friend meet us at the flat which was fine. We ran about 40 minutes late getting there due to some traffic in CZ, but all worked out fine in the end. Eva wrote a local guide for the area which we found particularly useful.
I would highly recommend this flat to anyone staying in Vienna.