Martin's apartment was perfect for my partner and I's 2 night stay in Vienna. It is only about 350m on foot to the nearest train station and then only a few stops to the Centre. There are multiple supermarkets within walking distance too (~300m).
A major selling point for us was the SECURE PARKING for our hire car, it is in the secure basement parking on the apartment building.
The kitchen has the basic utensils for simple cooking and handy appliances (kettle, percolator coffee machine, toaster, Microwave etc).
Wifi was great, no issues. There's also handy things like a washing machine and a drying rack, and an iron as well.
If you like your windows open at night, just be aware the road is quite noisy but we used earplugs :-)