I stayed for four nights in Vienna and I had the most perfect time in Andrei's loft. The apartment is as described, very cosy and functionnal. Just be careful in the staircase though, it can be a little slippery!
The neighborhood is great, the street is very quiet but there are a lot of shops and restaurants nearby. The subway is close (5 minute walk) and you can reach any part of the city very easily.
I didn't get the chance to meet Andrei in person but I was welcomed by his father, George, a very kind man who was of a great help, especially on my departure day, as he agreed to keep my luggage all morning. Thanks again George!
I definitely recommand this place and would totally stay here again!