My flat in the 5th district of Vienna is for one person (ideally). A supermarket is just across the street and you will find everything else you need in walking distance. Go to the city center in 10 to 15 minutes.
Because I am moving right now, I can't offer a regular bed. But the sofa is just as good and you can store your clothes and other stuff in the second room. I don't live in this flat anymore so you can have all for yourself! Of course you can use the wifi, washing machine and kitchen.