Martin's place is at a great location, within walking distance from the main train station and an U-Bahn station. This makes it really easy to get around in Vienna. The amenities such as the dishwasher and washing machine are a nice addition, and the place was comfy. Overall, we were satisfied with our experience but have had some minor inconveniences.
This is an apartment rented by the company called CheckVienna, and they happen to also list it on Airbnb. As such, you might be able to find a better deal on their site. Also, all communication between from them comes from a CheckVienna email address. This was a bit confusing at first as I expected the host to contact me through Airbnb messages - with that being said, you can also communicate with them through here.
There are not too many electrical outlets in the main living space. One of the sockets was half hanging off the wall which looked pretty dangerous.
The dishwasher still had the (cleaned) dishes of the previous tenants inside.
We also had an internet failure that lasted from 10pm well into the next morning. Apparently, our router was located at one of the neighboring units and the tenants there (another Airbnb I assume) disconnected it from the power supply.