I met with a neighbour of Maria for the key as Maria had to go out of the city but she was readily available to answer all my questions. The neighbour was very helpful as if Maria herself was there.

I like to explore so I didn't need much help anyways but they put me on a good start with some basic info I did ask of them.

Excellent host, good communication, very cosy apartment, my next visit to Vienna, I'm trying this first if it's available. My sincere recommendation.