Hello Edmond and thank you for your review!
I just wanted to mention that the apartment is really well located at "Votivkirche"/University" and everyone who knows Vienna well would agree with me. There are lots os restaurants around the apartment since the Universität Wien is located right in front of the apartment and students got to eat somewhere.
Also there are 2 groceries shops not even 300m from the apartment (BILLA and BILLABOX).
Regarding Touristic attractions, they are spread through the whole city, but the main ones are in the first district, which is just 3 minutes away. Also Rathaus, Parlament, Schwedenplatz are all around and I wouldn't take public transportation to get there since the 5-10 minutes walk is just beautiful.
Also I use to send all my guest through (Hidden by Airbnb) advises like restaurants and groceries, however this day I was in a huge rush, as I told you.
All in one, I apologize for the time you lost searching for groceries shops/restaurants, I could have helped you out with that. However, since you still gave 5 stars to the apartment, I do hope that you enjoyed the apartment and had a nice time in Vienna =)