This is a wonderful large one-bedroom apartment. The building is old, but the apartment is very modern and in excellent condition. There is even central heating. Every room is warm! Everything works perfectly.
The location is nominally outside of the inner City (in District 2), but no more then 10 minutes from there. Literally entire downtown is within half an hour walking distance. You don't necessarily need even a public transportation ticket here, unless you want to go to suburbs.
Definitively recommend for your base in Vienna!