Sky Flats is a safe, 10 min walk to the historic district. Alternatively, the U-bahn is right across the street. It is very easy to navigate and will take you anywhere in Vienna very quickly!
I have nothing but good things to say. It was safe, spotless, sheik, and quiet.
We enjoyed many of the local restaurants and had a more authentic Vienna experience. There is an open air market a block away - very similar to the Nachmarket, but without the annoying vendors shoving olives at you.
Wilifried is a great host , easy to communicate and very helpful.
5 stars