Sladjan was a great host, easy to communicate with, and happy to share Vienna knowledge. Flat was clean, well appointed and the deck was great (Sladjan has a green thumb). We had a fan to cool off, since the temps were in the 30's (around 100 f). Room was a bit tight with our luggage but comfortable.
U2 line is couple blocks away, U1 a bit further. We found it easiest to use U2 to go straight to Karlsplatz or transfer to u1 to get to St Stephen which is essentially the center of old Town.
It's a quiet location and windows open for air works great. Lastly the five flights up are worth that deck view!
Recommended!