Milena's apartment is located at an extremely convenient place - it's easy to access the airport and metro, but it's also a walking distance from all the great places in Vienna. Also, there's a big choices of places to eat and drink in the immediate vicinity.
Regarding the apartment itself, it was probably the most stylish space I have occupied so far :) Fellow travellers, just keep in mind that you can see and hear pretty much everything going on in the bathroom, so I'd say it's best for couples/solitary explorers.
Finally, Milena is a super kind host, who is very responsive and gave us lots of valuable information about Vienna and getting the best of our stay. We really enjoyed our stay with her and recommend it to anyone going to Vienna.