We stayed in Ekaterina's apartment for 2 nights and it was a wonderful experience.
The apartment, a loft apartment on the top floor, is very nice and very nicely furnished.
It is located right in the heart of Vienna beside St. Stephen's Cathedral and there is a metro station just a 5 minute walk away, which easily connects you to any other attractions or destinations around Vienna.
The loft was comfortable, clean, and very well-equipped with items for cooking and laundry. The rooms are spacious, with comfortable beds. There was a good heating and cooling system,
Ekaterina has been very kind and gave us useful suggestion to enjoy our stay. We loved staying in her apartment and would highly recommend it to anyone visiting Vienna!