We really enjoyed our stay at Michael's place. In walking distance (less than 15 minutes walk) from Hauptbahnhof along the nice pedestrianized street (Favoritenstraße), U-bahn station nearby, microwave, kitchen, fridge, coffee machine, lockable room, nice interior design. Everything is well-thought-out and on its proper place. Surely I recommend it to anyone who intends to stay in Vienna, especially if you intend to travel on trains often.