The apartment is amazing: Spacious and chic, quiet, extremely clean and very close to many cultural sights of Vienna (Museums, the opera, the Musikverein). For three days we didn't need any public transport. Also, there are many restaurants around to go out for dinner and drinks (Eva and Michi have many good recommendations!)
The welcome was cordial and at the same time concise and helpful, Eva and Michi have a lot of experience and I will definitely come back to this apartment the next time I visit Vienna. Thank you!!