Lily was a wonderful host. We have not met her in person, but for any issue she was quick to respond and provide an immediate solution.
As far as the apartment is concerned, I have the best to say. Super clean, minimal, modern yet cozy space with lovely high ceilings. It's better than it looks from the pictures.
As for location, I will say it was ok. It has everything nearby to meet your basic needs and the main thing is that it also has easy access to public transport.
I highly recommend Lili's apartment and if the road brings us to Vienna again I have no second thoughts about where we will stay.
And finally, Vienna is a city you "must" visit.