The apartment is really well located, it is pretty easy to reach from the Wien Hbf. The U2 line stops right next to the building and the tram departs from one road down. You are in the major tourism area so all restaurants and cafes near by are relatively expensive (but Vienna is also pretty expensive anyway!) there is a great Spar down the road so you can make good meals at home.
The main bedroom is huge, kitchen is good for making meals, but you need your own oil, salt, coffee (no free groceries at all except dishwashing tablets).
I wouldn’t stay here again with a friend, as the second bedroom is much smaller and the living room isn’t a comfortable chill space for two couples or a couple and one friend. If you are traveling as a couple, or maybe have one child, this would be awesome. There is only one toilet, and one bath-shower, even though there are 2 bathrooms.
Check in is a bit of a problem if you done have a local SIM card as you have to call to get in. We got in by chance as a neighbour helped us. You also have to know that “top” means apartment and the instructions about what floor it is on were not super clear (3rd). The key pad is small, black and on the right side of the door - also not super clear.
The host replies really quickly, so that’s great, if you have internet!