This is a great place to stay if you are interested in seeing Vienna. It's very close (literally across the street) from a major U6 line subway station. Also, a number of trams leave this location and travel into the Schottentor Ring stop. From there, it's just a bus transfer or 10 minute walk into the center of the city.
Though we didn't meet Michael, he's a great host. Directions for check-in were clearly communicated a few days ahead of time and confirmed on the day of arrival. Directions for check out were the same. He also included several bits of information about some grocery stores, cafes, and restaurants near the airbnb.
The apartment itself was very nice. It's not fancy, and is located in an older building, but it was very clean and quite comfortable. All the basic amenities were included and several extra things that were unexpected: an Italian espresso pot, for instance; several fans; and a washing machine for doing laundry. Also, there were plates, cups, bowls, utensils and everything you might need for a few days away from home. We slept 5 people comfortably and could have fit one more without a problem. Michael was even considerate enough to ask if we needed a crib for a child (we did not). But the gesture was appreciated.
There's Wifi throughout the apartment. It's not fast, nor always consistent, but it's sufficient to do basic things.
We did have something unexpected occur which, I think, demonstrates the nature of the host. At some point in the stay, the deadbolt on the door broke and we were locked inside the apartment. I called Michael, and he answered. He immediately said he would have the cleaning staff on their way to assist. As it turns out, I was able to shimmy the lock open with the apartment's tool set (another nice, and very useful included feature!) and we did not need the assistance that he was sending. Still, the communication with Michael was very helpful and calming. Then, throughout the day, he continued to check up on us to make sure we were ok.
All in all, it was a great stay. Clean, comfortable, convenient, affordable.