We had a wonderful stay at Markus's apartment. It is a lovely, light-filled, modern space, with a well equipped kitchen, basic ingredients for meal preparation, morning coffee, and beer and water in the fridge. Markus was a great host and communication with him was excellent throughout our stay.
Check-in was well documented along with other very useful information that he sent out a few days before our arrival. It was a simple process to pick up the key close to the apartment. The neighborhood is very nice with supermarkets, bakeries and restaurants close by.
The U bahn is a few minutes walk away, as is bus number 13a which goes directly to the main train station. Our favorite walk to the center of town was through the Naschmarkt which is a lively place to walk and eat.
We highly recommend Markus's place as a great base for exploring Vienna.