I stayed at Tobias' place with a friend and we had a great stay. The apartment is really nice, actually better than the photos I'd say. Very chic. My buddy slept in the bedroom and I had the couch in the living room. It didn't look much for the world, but was really comfy and I slept incredibly well. It helped a lot that the building is really quiet.
We didn't do any cooking, but the apartment look well-equipped and everything as clean and well functioning. There was a big terrace which was too cold to spend any time on in december, but much be really nice in the spring and summer.
Check in and communication was really smooth. Tobias was helpful in answering on messages, and we were welcomed by his parents who lives next door. Very nice and easy going.
The area is quite calm, but a short walk to the center and to the Wien Mitte, where the Airport trains go. Very convenient. There is also a nice tram which goes just outside the appartment, and will take you all around the city center. I didn't see the recommendations/guide of the neighborhood until now, but visited some of the places by chance anyway. Good stuff all around.
All in all I highly recommend this living and would stay here again if I'd ever go back to Vienna.